iOS Development-nstimer

Three ways to create a timer object

First, these two class methods create aTimerand assign it to a defaultRunloopMode + (Nstimer*)Scheduledtimerwithtimeinterval:(nstimeinterval) ti invocation:(nsinvocation*)invocation repeats:(BOOL) Yesorno;+ (Nstimer*)Scheduledtimerwithtimeinterval:(nstimeinterval) ti Target:(ID) atarget selector:(SEL) aselector UserInfo:(ID) userInfo repeats:(BOOL) YesornoTwo, these two class methods create aTimerobject, not assigning it to whichRunloop. (when created, you must manually call theNsrunloopThe corresponding method under theAddTimer: Formode: Go to assign it to aRunloopmode.) + (Nstimer*)Timerwithtimeinterval:(nstimeinterval) ti Target:(ID) atarget selector:(SEL) aselector UserInfo:(ID) userInfo repeats:(BOOL) Yesorno;+ (Nstimer*)Timerwithtimeinterval:(nstimeinterval) ti invocation:(nsinvocation*)invocation repeats:(BOOL) Yesorno; third, create aNstimer(when created, you must manually call theNsrunloopThe corresponding method under theAddTimer: Formode: Go to assign it to aRunloopmode.)-(Instancetype)initwithfiredate:(NSDate*)Date interval:(nstimeinterval) ti Target:(ID) T selector:(SEL) s UserInfo:(ID) UI repeats:(BOOL) rep- 

Typically used

+ (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(id)userInfo repeats:(BOOL)yesOrNo;TimeInterval：时间间隔，浮点型的值。小于0时系统默认为0.1。用于指定没间隔该时间段触发一次指定的方法target：方法作用对象 比如self selector：作用方法userInfo：当定时器失效时，由你指定的对象保留和释放该定时器。通常为nilrepeats：YES时，不断循环直至计时器失效或被释放。NO时只循环一次就失效

The rest of the methods introduce

- (void)fire;立即触发计时器- (void)invalidate;停止计时并使触发器失效- (BOOL)isValid;判断触发器是否有效- (NSTimeInterval)timeInterval;触发间隔时间- (id)userInfo;一般为nil- (NSDate *)fireDate;//开始时间- (void)setFireDate:(NSDate *)date;//设置fireData，其实暂停、开始会用到

A brief description of the timer pause and start

[timer setFireDate:[NSDate distantPast]];//开启[timer setFireDate:[NSDate//继续。[timer setFireDate:[NSDate distantFuture]];//暂停暂停之后计时器仍然有效，而如果用invalidate则会失效

Before invalidate, it is better to use IsValid first to determine whether or not in the thread

if ([timer isValid] == YES) {        [timer invalidate];        timer = nil;}

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iOS Development-nstimer