透彻讲解instancesRespondToSelector与respondsToSelector的区别
2016-08-04 15:45
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本篇幅转载于http://www.cnblogs.com/wayne23/p/3872776.html
Text1.h
@interface Test1 : NSObject
- (void)objectFun;
+ (void)classFun;
@end
Text1.m
@implementation Test1
- (void)objectFun
{
NSLog(@"object function");
}
+ (void)classFun
{
NSLog(@"class function");
}
@end
测试类:
BOOL flag;
flag = [Test1 instancesRespondToSelector:@selector(objectFun)]; //YES
flag = [Test1 instancesRespondToSelector:@selector(classFun)]; //NO
flag = [Test1 respondsToSelector:@selector(objectFun)]; //NO
flag = [Test1 respondsToSelector:@selector(classFun)]; //YES
Test1 *obj = [[Test1 alloc] init];
flag = [obj respondsToSelector:@selector(objectFun)]; //YES
flag = [obj respondsToSelector:@selector(classFun)]; //NO
总结:
1. instancesRespondToSelector只能写在类名后面,respondsToSelector可以写在类名和实例名后面。
2. [类 instancesRespondToSelector]判断的是该类的实例是否包含某方法,等效于:[该类的实例 respondsToSelector]。
3. [类 respondsToSelector]用于判断是否包含某个类方法。
Text1.h
@interface Test1 : NSObject
- (void)objectFun;
+ (void)classFun;
@end
Text1.m
@implementation Test1
- (void)objectFun
{
NSLog(@"object function");
}
+ (void)classFun
{
NSLog(@"class function");
}
@end
测试类:
BOOL flag;
flag = [Test1 instancesRespondToSelector:@selector(objectFun)]; //YES
flag = [Test1 instancesRespondToSelector:@selector(classFun)]; //NO
flag = [Test1 respondsToSelector:@selector(objectFun)]; //NO
flag = [Test1 respondsToSelector:@selector(classFun)]; //YES
Test1 *obj = [[Test1 alloc] init];
flag = [obj respondsToSelector:@selector(objectFun)]; //YES
flag = [obj respondsToSelector:@selector(classFun)]; //NO
总结:
1. instancesRespondToSelector只能写在类名后面,respondsToSelector可以写在类名和实例名后面。
2. [类 instancesRespondToSelector]判断的是该类的实例是否包含某方法,等效于:[该类的实例 respondsToSelector]。
3. [类 respondsToSelector]用于判断是否包含某个类方法。
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