runtime的个人简单封装
Runtime是想要做好iOS开发,或者说是真正的深刻的掌握OC这门语言所必需理解的东西。最近在学习Runtime,有自己的一些心得,整理如下,
一为 查阅方便
二为 或许能给他人一些启发,
三为 希望得到大家对这篇整理不足之处的一些指点。
什么是Runtime
我们写的代码在程序运行过程中都会被转化成runtime的C代码执行,例如[target doSomething];会被转化成objc_msgSend(target, @selector(doSomething));。
OC中一切都被设计成了对象,我们都知道一个类被初始化成一个实例,这个实例是一个对象。实际上一个类本质上也是一个对象,在runtime中用结构体表示。
但是单纯的去调用又显得很麻烦,所有就自己简单的封装了几个方法,可以和大家一起交流学习
/** 获取类名 @param class <#class description#> @return <#return value description#> */ + (NSString *)fetchClassName:(Class)class{ const char *className = class_getName(class); return [NSString stringWithUTF8String:className]; } /** 获取成员变量 @param class <#class description#> @return <#return value description#> */ + (NSArray*)fetchIvaList:(Class)class{ unsigned int count = 0; Ivar *ivarList = class_copyIvarList(class, &count); NSMutableArray *mutaList = [[NSMutableArray alloc]initWithCapacity:count]; for (unsigned int i=0; i<count; i++) { NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithCapacity:2]; const char*ivarName = ivar_getName(ivarList[i]); const char*ivarType = ivar_getTypeEncoding(ivarList[i]); dic[@"type"] = [NSString stringWithUTF8String:ivarType]; dic[@"ivarName"] = [NSString stringWithUTF8String:ivarName]; [mutaList addObject:dic]; } free(ivarList); return [NSArray arrayWithArray:mutaList]; /** 获取类的属性 @param NSArray <#NSArray description#> @return <#return value description#> */ } + (NSArray*)fetchPropertyList:(Class)class{ unsigned int count =0; objc_property_t*propertyList = class_copyPropertyList(class, &count); NSMutableArray *mutableList = [[NSMutableArray alloc]initWithCapacity:count]; for (unsigned int i=0; i<count; i++) { const char*propertyName = property_getName(propertyList[i]); [mutableList addObject:[NSString stringWithUTF8String:propertyName]]; } free(propertyList); return [NSArray arrayWithArray:mutableList]; } /** 类的实例方法 @param class <#class description#> @return <#return value description#> */ + (NSArray*)fetchMethodList:(Class)class{ unsigned int count = 0; Method *methodList = class_copyMethodList(class, &count); NSMutableArray *mutableList = [NSMutableArray arrayWithCapacity:count]; for (unsigned int i=0; i<count; i++) { Method method = methodList[i]; SEL methodName = method_getName(method); [mutableList addObject:NSStringFromSelector(methodName)]; } free(methodList); return [NSArray arrayWithArray:mutableList]; }