標簽：ios開發入門

方法選擇器

1` instancesRespondToSelector

SEL sel = @selector(study); if([TRStudent

instancesRespondToSelector:sel] ==

YES)//判定TRStudent類中是否有sel這個實例方法(該語句只能判斷實例方法是否存在) {

NSLog(@"類TRStudent中有方法study"); }

2` respondsToSelector

if ([stu respondsToSelector:@selector(learn)] ==YES) {

NSLog(@"對象stu可以調用learn方法"); }

協議選擇器

3` conformsToProtocol

TRStudent *stu = [[TRStudent alloc]initWithName:@"張三"

andID:1000]; if ([TRStudent

conformsToProtocol:@protocol(NSCopying)]==YES) { ... }