通过method_exchangeImplementation、class_replaceMethod、method_setImplementation进行Method Swizzling时,对originalMethod和destMethod的要求如下:
(1)返回值类型可以不同。如:
- (void)func1:(NSString *)word{ NSLog(@"This is func1~"); } - (BOOL)func2:(NSString *)word{ NSLog(@"This is func2~"); return YES; }
(2)参数个数可以不同。如:
- (void)func1:(NSString *)word{ NSLog(@"This is func1~"); } - (void)func2:(NSString *)word sec:(NSString *)word2{ NSLog(@"This is func2~"); }
(3)但是!对应参数类型必须相同!!如:
- (void)func1:(NSString *)word{ NSLog(@"This is func1~"); } - (void)func2:(NSString *)word sec:(NSString *)word2{ NSLog(@"This is func2~"); }
第一个参数都为NSString类型。
- (void)func1:(NSString *)word sec:(int)word2 third:(BOOL)word3{ NSLog(@"This is func1~"); } - (void)func2:(NSString *)word sec:(int)word2 { NSLog(@"This is func2~"); }
func1第一个参数为NSString,func2第一个参数也为NSString;func1第二参数为int,func2第二个参数也为int。
- (void)func1:(NSString *)word sec:(int)word2 third:(BOOL)word3{ NSLog(@"This is func1~"); } - (void)func2:(NSString *)word sec:(int)word2 third:(NSString *)word3 { NSLog(@"This is func2~"); }
上面的情况则会报错!
本文出自 “Layne的学习园地” 博客,请务必保留此出处http://laynestone.blog.51cto.com/9459455/1701173
原文:http://laynestone.blog.51cto.com/9459455/1701173