ios方法延时的类目

01	@implementation NSObject (PerformBlockAfterDelay)

02

03	- (void)performBlock:(void (^)(void))block

04	afterDelay:(NSTimeInterval)delay

05

{

06	block = [[block copy] autorelease];

07	[self performSelector:@selector(fireBlockAfterDelay:)

08	withObject:block

09	afterDelay:delay];

10

}

11

12	- (void)fireBlockAfterDelay:(void (^)(void))block {

13

block();

14

}

15

16

@end