IOS 基础

定时器  NSTimer

步骤

生成NSTimer

id timer;

timer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(handleTimer:) userInfo:nil repeats:YES];

定时器函数：

- (void) handleTimer:(id)atimer

{

}

销毁定时器

[atimer invalidate];

taimer = nil;

接口编程之@protocol

1、接口声明。

文件A.h

@protocol ProcessDataDelegate<NSObject>

@required

-(void) processSuccessful:(BOOL)success;

@end

@interface A:NSObject

{

id<ProcessDataDelegate>delegate;

}

@property (retain) id delegate;

@end;

2、接口回调

文件A.m

@implementation A

@synthesize delegate;

- (void) processComplete

{

[[self delegate] processSuccessful:YES];

}

3、接口实现