有時候需要啥忽略警告的方法,特別是在.m文件中

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
        [myobj performSelector:sel];
        
        if([myobj respondsToSelector:sel2])//判斷方法是否已被實現
            [myobj performSelector:sel2];
        else
            NSLog(@"此對象沒有實現這個方法");