performSelector多个参数
performSelector多个参数
需求如题所示。。。。。 我们都知道
- (id)performSelector:(SEL)aSelector;
- (id)performSelector:(SEL)aSelector withObject:(id)object;
- (id)performSelector:(SEL)aSelector withObject:(id)object1 withObject:(id)object2;
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在NSObject中帮selector传递的参数个数最多是 2个 ，当时有时候如果某种需求。。。需要2个以上的参数该如何搞一搞了 ？？？ 其实网上有很多的例子
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | #import "NSObject+ArrayObjects.h"@implementation NSObject (ArrayObjects)-(id)performSelector:(SEL)aSelector withArray:(NSArray *)objects{ if (aSelector == nil || objects == nil) { @throw [NSException exceptionWithName:@"NullExcetption" reason: @"aSelector or objects is null" userInfo:nil]; return nil; } NSMethodSignature *methodSignature = [[self class] instanceMethodSignatureForSelector:aSelector]; if(methodSignature == nil) { @throw [NSException exceptionWithName:@"FunctionNotFoundExcetption" reason: [NSString stringWithFormat:@"the %@ not found",NSStringFromSelector(aSelector)] userInfo:nil]; return nil; } else { NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:methodSignature]; [invocation setTarget:self]; [invocation setSelector:aSelector]; //签名中方法参数的个数，内部包含了self和_cmd，所以参数从第3个开始 NSInteger signatureParamCount = methodSignature.numberOfArguments - 2; NSInteger requireParamCount = objects.count; NSInteger resultParamCount = MIN(signatureParamCount, requireParamCount); for (NSInteger i = 0; i < resultParamCount; i++) { id obj = objects[i]; [invocation setArgument:&obj atIndex:i+2]; } [invocation invoke]; id callBackObject = nil; if(methodSignature.methodReturnLength) { [invocation getReturnValue:&callBackObject]; } return callBackObject; }}@end |
虽然这个一度娘就能度到，而且感觉很牛逼，其实是有bug和缺陷性的，然后对数组里面的数据有要求，我们都知道OC是兼容C代码的。。往里面放入block或结构体就瞎了。。。。。。 我在测试AFNetworking项目的时候发现上面代码存在问题，然后找到了一个比较好一点的解决方案 ，当然github上搞一搞的 ，感觉还可以没报错
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | #import <Foundation/Foundation.h>@interface NSObject (VKMsgSend)+ (id)VKCallSelector:(SEL)selector error:(NSError *__autoreleasing *)error,...;+ (id)VKCallSelectorName:(NSString *)selName error:(NSError *__autoreleasing *)error,...;- (id)VKCallSelector:(SEL)selector error:(NSError *__autoreleasing *)error,...;- (id)VKCallSelectorName:(NSString *)selName error:(NSError *__autoreleasing *)error,...;@end@interface NSString (VKMsgSend)- (id)VKCallClassSelector:(SEL)selector error:(NSError *__autoreleasing *)error,...;- (id)VKCallClassSelectorName:(NSString *)selName error:(NSError *__autoreleasing *)error,...;- (id)VKCallClassAllocInitSelector:(SEL)selector error:(NSError *__autoreleasing *)error,...;- (id)VKCallClassAllocInitSelectorName:(NSString *)selName error:(NSError *__autoreleasing *)error,...;@end |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 | #import "VKMsgSend.h"#if TARGET_OS_IPHONE#import <UIKit/UIApplication.h>#endif#pragma mark : vk_nilObject@interface vk_pointer : NSObject@property (nonatomic) void *pointer;@end@implementation vk_pointer@end@interface vk_nilObject : NSObject@end@implementation vk_nilObject@end#pragma mark : staticstatic NSLock *_vkMethodSignatureLock;static NSMutableDictionary *_vkMethodSignatureCache;static vk_nilObject *vknilPointer = nil;static NSString *vk_extractStructName(NSString *typeEncodeString){ NSArray *array = [typeEncodeString componentsSeparatedByString:@"="]; NSString *typeString = array[0]; __block int firstVaildIndex = 0; [array enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) { unichar c = [typeEncodeString characterAtIndex:idx]; if (c=='{'||c=='_') { firstVaildIndex++; }else{ *stop = YES; } }]; return [typeString substringFromIndex:firstVaildIndex];}static NSString *vk_selectorName(SEL selector){ const char *selNameCstr = sel_getName(selector); NSString *selName = [[NSString alloc]initWithUTF8String:selNameCstr]; return selName;}static NSMethodSignature *vk_getMethodSignature(Class cls, SEL selector){ if (!_vkMethodSignatureLock) { _vkMethodSignatureLock = [[NSLock alloc] init]; } [_vkMethodSignatureLock lock]; if (!_vkMethodSignatureCache) { _vkMethodSignatureCache = [[NSMutableDictionary alloc]init]; } if (!_vkMethodSignatureCache[cls]) { _vkMethodSignatureCache[(id<NSCopying>)cls] =[[NSMutableDictionary alloc]init]; } NSString *selName = vk_selectorName(selector); NSMethodSignature *methodSignature = _vkMethodSignatureCache[cls][selName]; if (!methodSignature) { methodSignature = [cls instanceMethodSignatureForSelector:selector]; if (methodSignature) { _vkMethodSignatureCache[cls][selName] = methodSignature; }else { methodSignature = [cls methodSignatureForSelector:selector]; if (methodSignature) { _vkMethodSignatureCache[cls][selName] = methodSignature; } } } [_vkMethodSignatureLock unlock]; return methodSignature;}static void vk_generateError(NSString *errorInfo, NSError **error){ if (error) { *error = [NSError errorWithDomain:errorInfo code:0 userInfo:nil]; }}static id vk_targetCallSelectorWithArgumentError(id target, SEL selector, NSArray *argsArr, NSError *__autoreleasing *error){ Class cls = [target class]; NSMethodSignature *methodSignature = vk_getMethodSignature(cls, selector); NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:methodSignature]; [invocation setTarget:target]; [invocation setSelector:selector]; NSMutableArray* _markArray; for (NSUInteger i = 2; i< [methodSignature numberOfArguments]; i++) { const char *argumentType = [methodSignature getArgumentTypeAtIndex:i]; id valObj = argsArr[i-2]; switch (argumentType[0]=='r'?argumentType[1]:argumentType[0]) { #define VK_CALL_ARG_CASE(_typeString, _type, _selector) \ case _typeString: { \ _type value = [valObj _selector]; \ [invocation setArgument:&value atIndex:i];\ break; \ } VK_CALL_ARG_CASE('c', char, charValue) VK_CALL_ARG_CASE('C', unsigned char, unsignedCharValue) VK_CALL_ARG_CASE('s', short, shortValue) VK_CALL_ARG_CASE('S', unsigned short, unsignedShortValue) VK_CALL_ARG_CASE('i', int, intValue) VK_CALL_ARG_CASE('I', unsigned int, unsignedIntValue) VK_CALL_ARG_CASE('l', long, longValue) VK_CALL_ARG_CASE('L', unsigned long, unsignedLongValue) VK_CALL_ARG_CASE('q', long long, longLongValue) VK_CALL_ARG_CASE('Q', unsigned long long, unsignedLongLongValue) VK_CALL_ARG_CASE('f', float, floatValue) VK_CALL_ARG_CASE('d', double, doubleValue) VK_CALL_ARG_CASE('B', BOOL, boolValue) case ':':{ NSString *selName = valObj; SEL selValue = NSSelectorFromString(selName); [invocation setArgument:&selValue atIndex:i]; } break; case '{':{ NSString *typeString = vk_extractStructName([NSString stringWithUTF8String:argumentType]); NSValue *val = (NSValue *)valObj; #define vk_CALL_ARG_STRUCT(_type, _methodName) \ if ([typeString rangeOfString:@#_type].location != NSNotFound) { \ _type value = [val _methodName]; \ [invocation setArgument:&value atIndex:i]; \ break; \ } vk_CALL_ARG_STRUCT(CGRect, CGRectValue) vk_CALL_ARG_STRUCT(CGPoint, CGPointValue) vk_CALL_ARG_STRUCT(CGSize, CGSizeValue) vk_CALL_ARG_STRUCT(NSRange, rangeValue) vk_CALL_ARG_STRUCT(CGAffineTransform, CGAffineTransformValue) vk_CALL_ARG_STRUCT(UIEdgeInsets, UIEdgeInsetsValue) vk_CALL_ARG_STRUCT(UIOffset, UIOffsetValue) vk_CALL_ARG_STRUCT(CGVector, CGVectorValue) } break; case '*':{ NSCAssert(NO, @"argument boxing wrong,char* is not supported"); } break; case '^':{ vk_pointer *value = valObj; void *pointer = value.pointer; id obj = *((__unsafe_unretained id *)pointer); if (!obj) { if (argumentType[1] == '@') { if (!_markArray) { _markArray = [[NSMutableArray alloc] init]; } [_markArray addObject:valObj]; } } [invocation setArgument:&pointer atIndex:i]; } break; case '#':{ [invocation setArgument:&valObj atIndex:i]; } break; default:{ if ([valObj isKindOfClass:[vk_nilObject class]]) { [invocation setArgument:&vknilPointer atIndex:i]; }else{ [invocation setArgument:&valObj atIndex:i]; } } } } [invocation invoke]; if ([_markArray count] > 0) { for (vk_pointer *pointerObj in _markArray) { void *pointer = pointerObj.pointer; id obj = *((__unsafe_unretained id *)pointer); if (obj) { CFRetain((__bridge CFTypeRef)(obj)); } } } const char *returnType = [methodSignature methodReturnType]; NSString *selName = vk_selectorName(selector); if (strncmp(returnType, "v", 1) != 0 ) { if (strncmp(returnType, "@", 1) == 0) { void *result; [invocation getReturnValue:&result]; if (result == NULL) { return nil; } id returnValue; if ([selName isEqualToString:@"alloc"] || [selName isEqualToString:@"new"] || [selName isEqualToString:@"copy"] || [selName isEqualToString:@"mutableCopy"]) { returnValue = (__bridge_transfer id)result; }else{ returnValue = (__bridge id)result; } return returnValue; } else { switch (returnType[0] == 'r' ? returnType[1] : returnType[0]) { #define vk_CALL_RET_CASE(_typeString, _type) \ case _typeString: { \ _type returnValue; \ [invocation getReturnValue:&returnValue];\ return @(returnValue); \ break; \ } vk_CALL_RET_CASE('c', char) vk_CALL_RET_CASE('C', unsigned char) vk_CALL_RET_CASE('s', short) vk_CALL_RET_CASE('S', unsigned short) vk_CALL_RET_CASE('i', int) vk_CALL_RET_CASE('I', unsigned int) vk_CALL_RET_CASE('l', long) vk_CALL_RET_CASE('L', unsigned long) vk_CALL_RET_CASE('q', long long) vk_CALL_RET_CASE('Q', unsigned long long) vk_CALL_RET_CASE('f', float) vk_CALL_RET_CASE('d', double) vk_CALL_RET_CASE('B', BOOL) case '{': { NSString *typeString = vk_extractStructName([NSString stringWithUTF8String:returnType]); #define vk_CALL_RET_STRUCT(_type) \ if ([typeString rangeOfString:@#_type].location != NSNotFound) { \ _type result; \ [invocation getReturnValue:&result];\ NSValue * returnValue = [NSValue valueWithBytes:&(result) objCType:@encode(_type)];\ return returnValue;\ } vk_CALL_RET_STRUCT(CGRect) vk_CALL_RET_STRUCT(CGPoint) vk_CALL_RET_STRUCT(CGSize) vk_CALL_RET_STRUCT(NSRange) vk_CALL_RET_STRUCT(CGAffineTransform) vk_CALL_RET_STRUCT(UIEdgeInsets) vk_CALL_RET_STRUCT(UIOffset) vk_CALL_RET_STRUCT(CGVector) } break; case '*':{ } break; case '^': { } break; case '#': { } break; } return nil; } } return nil;};static NSArray *vk_targetBoxingArguments(va_list argList, Class cls, SEL selector, NSError *__autoreleasing *error){ NSMethodSignature *methodSignature = vk_getMethodSignature(cls, selector); NSString *selName = vk_selectorName(selector); if (!methodSignature) { NSString* errorStr = [NSString stringWithFormat:@"unrecognized selector (%@)", selName]; vk_generateError(errorStr,error); return nil; } NSMutableArray *argumentsBoxingArray = [[NSMutableArray alloc]init]; for (NSUInteger i = 2; i < [methodSignature numberOfArguments]; i++) { const char *argumentType = [methodSignature getArgumentTypeAtIndex:i]; switch (argumentType[0] == 'r' ? argumentType[1] : argumentType[0]) { #define vk_BOXING_ARG_CASE(_typeString, _type)\ case _typeString: {\ _type value = va_arg(argList, _type);\ [argumentsBoxingArray addObject:@(value)];\ break; \ }\ vk_BOXING_ARG_CASE('c', int) vk_BOXING_ARG_CASE('C', int) vk_BOXING_ARG_CASE('s', int) vk_BOXING_ARG_CASE('S', int) vk_BOXING_ARG_CASE('i', int) vk_BOXING_ARG_CASE('I', unsigned int) vk_BOXING_ARG_CASE('l', long) vk_BOXING_ARG_CASE('L', unsigned long) vk_BOXING_ARG_CASE('q', long long) vk_BOXING_ARG_CASE('Q', unsigned long long) vk_BOXING_ARG_CASE('f', double) vk_BOXING_ARG_CASE('d', double) vk_BOXING_ARG_CASE('B', int) case ':': { SEL value = va_arg(argList, SEL); NSString *selValueName = NSStringFromSelector(value); [argumentsBoxingArray addObject:selValueName]; } break; case '{': { NSString *typeString = vk_extractStructName([NSString stringWithUTF8String:argumentType]); #define vk_FWD_ARG_STRUCT(_type, _methodName) \ if ([typeString rangeOfString:@#_type].location != NSNotFound) { \ _type val = va_arg(argList, _type);\ NSValue* value = [NSValue _methodName:val];\ [argumentsBoxingArray addObject:value]; \ break; \ } vk_FWD_ARG_STRUCT(CGRect, valueWithCGRect) vk_FWD_ARG_STRUCT(CGPoint, valueWithCGPoint) vk_FWD_ARG_STRUCT(CGSize, valueWithCGSize) vk_FWD_ARG_STRUCT(NSRange, valueWithRange) vk_FWD_ARG_STRUCT(CGAffineTransform, valueWithCGAffineTransform) vk_FWD_ARG_STRUCT(UIEdgeInsets, valueWithUIEdgeInsets) vk_FWD_ARG_STRUCT(UIOffset, valueWithUIOffset) vk_FWD_ARG_STRUCT(CGVector, valueWithCGVector) } break; case '*':{ vk_generateError(@"unsupported char* argumenst",error); return nil; } break; case '^': { void *value = va_arg(argList, void**); vk_pointer *pointerObj = [[vk_pointer alloc]init]; pointerObj.pointer = value; [argumentsBoxingArray addObject:pointerObj]; } break; case '#': { Class value = va_arg(argList, Class); [argumentsBoxingArray addObject:(id)value];// vk_generateError(@"unsupported class argumenst",error);// return nil; } break; case '@':{ id value = va_arg(argList, id); if (value) { [argumentsBoxingArray addObject:value]; }else{ [argumentsBoxingArray addObject:[vk_nilObject new]]; } } break; default: { vk_generateError(@"unsupported argumenst",error); return nil; } } } return [argumentsBoxingArray copy];}@implementation NSObject (VKMsgSend)+ (id)VKCallSelectorName:(NSString *)selName error:(NSError *__autoreleasing *)error,...{ va_list argList; va_start(argList, error); SEL selector = NSSelectorFromString(selName); NSArray *boxingAruments = vk_targetBoxingArguments(argList, [self class], selector, error); va_end(argList); if (!boxingAruments) { return nil; } return vk_targetCallSelectorWithArgumentError(self, selector, boxingAruments, error);}+ (id)VKCallSelector:(SEL)selector error:(NSError *__autoreleasing *)error,...{ va_list argList; va_start(argList, error); NSArray* boxingArguments = vk_targetBoxingArguments(argList, [self class], selector, error); va_end(argList); if (!boxingArguments) { return nil; } return vk_targetCallSelectorWithArgumentError(self, selector, boxingArguments, error);}- (id)VKCallSelectorName:(NSString *)selName error:(NSError *__autoreleasing *)error,...{ va_list argList; va_start(argList, error); SEL selector = NSSelectorFromString(selName); NSArray* boxingArguments = vk_targetBoxingArguments(argList, [self class], selector, error); va_end(argList); if (!boxingArguments) { return nil; } return vk_targetCallSelectorWithArgumentError(self, selector, boxingArguments, error);}- (id)VKCallSelector:(SEL)selector error:(NSError *__autoreleasing *)error,...{ va_list argList; va_start(argList, error); NSArray* boxingArguments = vk_targetBoxingArguments(argList, [self class], selector, error); va_end(argList); if (!boxingArguments) { return nil; } return vk_targetCallSelectorWithArgumentError(self, selector, boxingArguments, error);}@end@implementation NSString (VKMsgSend)-(id)VKCallClassSelector:(SEL)selector error:(NSError *__autoreleasing *)error, ...{ Class cls = NSClassFromString(self); if (!cls) { NSString* errorStr = [NSString stringWithFormat:@"unrecognized className (%@)", self]; vk_generateError(errorStr,error); return nil; } va_list argList; va_start(argList, error); NSArray* boxingArguments = vk_targetBoxingArguments(argList, cls, selector, error); va_end(argList); if (!boxingArguments) { return nil; } return vk_targetCallSelectorWithArgumentError(cls, selector, boxingArguments, error);}-(id)VKCallClassSelectorName:(NSString *)selName error:(NSError *__autoreleasing *)error, ...{ Class cls = NSClassFromString(self); if (!cls) { NSString* errorStr = [NSString stringWithFormat:@"unrecognized className (%@)", self]; vk_generateError(errorStr,error); return nil; } SEL selector = NSSelectorFromString(selName); va_list argList; va_start(argList, error); NSArray* boxingArguments = vk_targetBoxingArguments(argList, cls, selector, error); va_end(argList); if (!boxingArguments) { return nil; } return vk_targetCallSelectorWithArgumentError(cls, selector, boxingArguments, error);}-(id)VKCallClassAllocInitSelector:(SEL)selector error:(NSError *__autoreleasing *)error, ...{ Class cls = NSClassFromString(self); if (!cls) { NSString* errorStr = [NSString stringWithFormat:@"unrecognized className (%@)", self]; vk_generateError(errorStr,error); return nil; } va_list argList; va_start(argList, error); NSArray* boxingArguments = vk_targetBoxingArguments(argList, cls, selector, error); va_end(argList); if (!boxingArguments) { return nil; } id allocObj = [cls alloc]; return vk_targetCallSelectorWithArgumentError(allocObj, selector, boxingArguments, error);}-(id)VKCallClassAllocInitSelectorName:(NSString *)selName error:(NSError *__autoreleasing *)error, ...{ Class cls = NSClassFromString(self); if (!cls) { NSString* errorStr = [NSString stringWithFormat:@"unrecognized className (%@)", self]; vk_generateError(errorStr,error); return nil; } SEL selector = NSSelectorFromString(selName); va_list argList; va_start(argList, error); NSArray* boxingArguments = vk_targetBoxingArguments(argList, cls, selector, error); va_end(argList); if (!boxingArguments) { return nil; } id allocObj = [cls alloc]; return vk_targetCallSelectorWithArgumentError(allocObj, selector, boxingArguments, error);}@end |
至于怎么使用 。。。。。。。。。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 | #import "ViewController.h"#import "VKMsgSend.h"#import <objc/message.h>@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; Class cls = NSClassFromString(@"testClassA"); id abc = [[cls alloc]init]; NSError *err; //this warning is ok Selector is in testClassA NSString *return1 = [abc VKCallSelector:@selector(testfunction:withB:) error:&err,4,3.5f]; NSLog(@"%@",return1); NSNumber *return3 = [abc VKCallSelectorName:@"testfunction:withB:withC:" error:nil,4,3.5,@"haha"]; NSInteger tureReturn3 = [return3 integerValue]; NSLog(@"%@",@(tureReturn3)); NSString *return4 = [abc VKCallSelectorName:@"testfunction:withB:withC:withD:" error:nil,4,3.5,nil, CGRectMake(10, 10, 10, 10)]; NSLog(@"%@",return4); NSError* testerr2; [abc VKCallSelectorName:@"testFunctionError:" error:nil,&testerr2]; NSLog(@"see more test case in XCTest Target"); NSLog(@"vk_msgSend_projTests"); //这是一段展示 performselector 缺点和不足的代码，有注释中文解释 [self performShow]; //这是一段展示 objc_msgsend 缺点和不足的代码，有注释和中文解释 [self msgsendShow]; //这是对比展示 VKMsgSend的代码 [self vkshow];}-(void)performShow{ Class cls = NSClassFromString(@"testClassA"); id abc = [[cls alloc]init]; //-(NSString*)testfunction:(int)num withB:(float)boolv NSString * result = [abc performSelector:@selector(testfunction:withB:) withObject:@4 withObject:@3.5]; NSLog(@"%@",result); //并且只支持id，如果你敢把基础数值类型封装成number传进去，数值还是错乱的 //这样代码跑进去 int 传了个NSNumber进去 函数内指针全乱，参数值都飞了 //3个参数就不支持了，打开注释你会发现，就没有传3个参数的方法// [abc performSelector:@selector(testfunction:withB:withC:) withObject:@4.5 withObject:@3 withObject:@"ssss"];}-(void)msgsendShow{ Class cls = NSClassFromString(@"testClassA"); id abc = [[cls alloc]init];// NSString *result = objc_msgSend(abc, @selector(testfunction:withB:), 4, 3.5); //很抱歉上面这样的方法，看着用的很方便，但是在iOS 64位下会直接崩溃，xcode8下是直接无法编译 NSString *result2 = ((NSString* (*)(id, SEL, int,float))objc_msgSend)(abc, @selector(testfunction:withB:), 4, 3.5); //看到没必须这么费劲的写一坨C语言的函数指针强转才可以 NSLog(@"%@",result2);}-(void)vkshow{ //理想状态下 旧的 objc_msgSend就已经很方便了，但是已经不能这么用了，那我就封装出了一个runtime工具 Class cls = NSClassFromString(@"testClassA"); id abc = [[cls alloc]init]; NSError * error; //很方便吧 [abc VKCallSelectorName:@"testfunction:withB:" error:&error,4,3.5]; //支持所有基础类型，结构体，id类型，class类型，selector类型，block类型，还有指针类型 ** //如果是使用类方法，还可以直接通过类名NSString [@"testClassA" VKCallClassSelectorName:@"testfunction:withB:withH" error:&error,4,3.5,@"aaa"]; //如果是实例方法，可以直接通过类名NSString，调用init selector，哪怕initWithXX:XX:等自定义的初始化函数都可以 id abcc = [@"testClassA" VKCallClassAllocInitSelectorName:@"init" error:nil]; NSLog(@"%@",abcc); //省去了手写NSClassFromString 的事情} |
当然，这里附上github地址 https://github.com/Awhisper/VKMsgSend
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版权声明：本文为CSDN博主「hebia0」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/chmod_R_755/article/details/78676395
分类:
ios之perform
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