IOS高级开发～Runtime（二）
6、获取一个类的所有方法：
u_int count;
Method * methods = class_copyMethodList([CustomClass class], &count);
for (int i = 0; i < count; i++) {
SEL name = method_getName(methods[i]);
NSString * strName = [NSString stringWithCString:sel_getName(name) encoding:NSUTF8StringEncoding];
NSLog(@"%@",strName);
}
运行结果：
2014-10-20 11:57:27.884 runtimetest[10939:303] fun1
2014-10-20 11:57:27.886 runtimetest[10939:303] fun3
2014-10-20 11:57:27.886 runtimetest[10939:303] varTest1
2014-10-20 11:57:27.886 runtimetest[10939:303] setVarTest1:
2014-10-20 11:57:27.887 runtimetest[10939:303] varTest2
2014-10-20 11:57:27.887 runtimetest[10939:303] setVarTest2:
2014-10-20 11:57:27.887 runtimetest[10939:303] varTest3
2014-10-20 11:57:27.888 runtimetest[10939:303] setVarTest3:
7
//获取一个类的所有属性
u_int count;
objc_property_t * properties = class_copyPropertyList([CustomClass class], &count);
for (int i = 0; i < count; i++) {
const char * propertyName = property_getName(properties[i]);
NSString * strName = [NSString stringWithCString:propertyName encoding:NSUTF8StringEncoding];
NSLog(@"%@",strName);
}
运行结果：
2014-10-20 12:01:23.508 runtimetest[11167:303] varTest1
2014-10-20 12:01:23.510 runtimetest[11167:303] varTest2
2014-10-20 12:01:23.510 runtimetest[11167:303] varTest3
8、获取／设置类的属性变量
//获取全局变量的值 （myFloat 为类的一个属性变量）
- (void) getInstanceVar {
float myFloatValue;
object_getInstanceVariable(self,"myFloat", (void*)&myFloatValue);
NSLog(@"%f", myFloatValue);
}
//设置全局变量的值
- (void) setInstanceVar {
float newValue = 10.00f;
unsigned int addr = (unsignedint)&newValue;
object_setInstanceVariable(self,"myFloat", *(float**)addr);
NSLog(@"%f", myFloat);
}
9、判断类的某个属性的类型
- (void) getVarType {
ClassCustomClass *obj = [ClassCustomClassnew];
Ivar var = class_getInstanceVariable(object_getClass(obj),"varTest1");
const char* typeEncoding =ivar_getTypeEncoding(var);
NSString *stringType = [NSStringstringWithCString:typeEncodingencoding:NSUTF8StringEncoding];
if ([stringType hasPrefix:@"@"]) {
// handle class case
NSLog(@"handle class case");
} else if ([stringTypehasPrefix:@"i"]) {
// handle int case
NSLog(@"handle int case");
} else if ([stringTypehasPrefix:@"f"]) {
// handle float case
NSLog(@"handle float case");
} else
{
}
}
10、通过属性的值来获取其属性的名字（反射机制）
- (NSString *)nameOfInstance:(id)instance
{
unsigned int numIvars =0;
NSString *key=nil;
//Describes the instance variables declared by a class.
Ivar * ivars = class_copyIvarList([ClassCustomClassclass], &numIvars);
for(int i = 0; i < numIvars; i++) {
Ivar thisIvar = ivars[i];
const char *type =ivar_getTypeEncoding(thisIvar);
NSString *stringType = [NSStringstringWithCString:typeencoding:NSUTF8StringEncoding];
//不是class就跳过
if (![stringType hasPrefix:@"@"]) {
continue;
}
//Reads the value of an instance variable in an object. object_getIvar这个方法中，当遇到非objective-c对象时，并直接crash
if ((object_getIvar(allobj, thisIvar) == instance)) {
// Returns the name of an instance variable.
key = [NSStringstringWithUTF8String:ivar_getName(thisIvar)];
break;
}
}
free(ivars);
return key;
}
测试代码：
allobj = [ClassCustomClassnew];
allobj.varTest1 =@"varTest1String";
allobj.varTest2 =@"varTest2String";
allobj.varTest3 =@"varTest3String";
NSString *str = [selfnameOfInstance:@"varTest1String"];
NSLog(@"str:%@", str);
打印结果：
2013-07-26 16:26:26.271 HighOC[7081:c07] str:varTest1
