initWithFireDate 方法参数说明。典型的selector 与 id userinfo 使用示例

- (id)initWithFireDate:(NSDate *)date interval:(NSTimeInterval)seconds target:(id)target selector:(SEL)aSelector userInfo:(id)userInfo repeats:(BOOL)repeats

date: 第一次 fire 时间

interval：重复fire的时间间隔，适用于repeats为YES

target：表示发送的对象，如self

aSelector：方法选择器，在时间间隔内，选择调用一个实例方法

userInfo：id类型，可以为空。可以在aSelector中强转回之前传入的类型。

repeats：当YES时，定时器会不断循环直至失效或被释放，当NO时，定时器会循环发送一次就失效。

/** * 启动一个NSTimer */-(void)timerTest{NSNumber* testValue = [NSNumber numberWithInt:100];NSDate* fireDate = [[NSDate alloc] initWithTimeIntervalSinceNow:5]; //5s 后 第一次 fireNSTimer* testTimer = [[NSTimer alloc] initWithFireDate:fireDate interval:5 target:self selector:@selector(timerSelector:) userInfo:testValue repeats:YES];[[NSRunLoop currentRunLoop] addTimer:testTimer forMode:NSDefaultRunLoopMode];}/** * NSTimer 执行函数 */-(void)timerSelector:(id)sender{int value = [(NSNumber*)[sender userInfo] intValue];//取回之前传入的数据NSLog(@"timerTest value: %d", value);//略...}

---- 参考内容：

请教,NSTimer怎么用?

@selector 里面的方法名不能加参数

 NSTimer类的使用

 http://linglong117.blog.163.com/blog/static/27714547201158545587/

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initWithFireDate:interval:target:selector:userInfo:repeats:

Initializes a new NSTimer object using the specified object and selector.

- (id)initWithFireDate:(NSDate *)date interval:(NSTimeInterval)seconds target:(id)target selector:(SEL)aSelector userInfo:(id)userInfo repeats:(BOOL)repeats

Parameters

date

The time at which the timer should first fire.

seconds

For a repeating timer, this parameter contains the number of seconds between firings of the timer. If seconds is less than or equal to0.0, this method chooses the nonnegative value of 0.1 milliseconds instead.

target

The object to which to send the message specified by aSelector when the timer fires. The target object is retained by the timer and released when the timer is invalidated.

aSelector

The message to send to target when the timer fires. The selector must have the following signature:

- (void)timerFireMethod:(NSTimer*)theTimer

The timer passes itself as the argument to this method.

userInfo

Custom user info for the timer. The object you specify is retained by the timer and released when the timer is invalidated. This parameter may benil.

repeats

If YES, the timer will repeatedly reschedule itself until invalidated. IfNO, the timer will be invalidated after it fires.

Return Value

The receiver, initialized such that, when added to a run loop, it will fire at date and then, if repeats isYES, every seconds after that.

Discussion

You must add the new timer to a run loop, using addTimer:forMode:. Upon firing, the timer sends the message aSelector to target. (If the timer is configured to repeat, there is no need to subsequently re-add the timer to the run loop.)

Availability

• Available in iOS 2.0 and later.

Related Sample Code

• TableViewSuite

Declared In

NSTimer.h