ios--Timer Example: Flash Sparkle (animation)

Animations implemented in this example: UIView timer disappears and then flashes, a flash of animation

Technology used: Timer (Nstimer) + animation (beginanimations/commitanimations)

Specific implementation steps:

The first step: the timer section is completely copied the previous example: http://blog.csdn.net/wanggsx918/article/details/38269919

1. Define a variable and a method in the. h file:

@interface xxxviewcontroller:uiviewcontroller{    nstimer *showtimer;//Timer Variable}//The method to execute-(void) Handlescrolltimer: ( Nstimer *) Thetimer;     -(void) Starttimer;

2. Open and close timers in. m files, and bind method:

-(void) Viewdidappear: (BOOL) animated  {/    //re-open the timer when the page is displayed    [Showtimer setfiredate:[nsdate Distantpast]];} -(void) starttimer{    //define Time Counter: Execute Handlescrolltimer method every 2 seconds    showtimer = [Nstimer scheduledtimerwithtimeinterval:2.0                                                 target:self                                               selector: @selector (handlescrolltimer:)                                               Userinfo:nil                                                Repeats:true];    [[Nsrunloop Currentrunloop] Addtimer:showtimer formode:nsdefaultrunloopmode];} When the page disappears, execute-(void) Viewdiddisappear: (BOOL) animated{    //off timer    [Showtimer setfiredate:[nsdate Distantfuture]];}

3. Start the timer:

    Open Thread    [self performselectoronmainthread: @selector (Starttimer) Withobject:nil Waituntildone:yes];

Step Two: Animation section

Write the animation code in the Handlescolltimer: method:

-(void) Handlescrolltimer: (Nstimer *) thetimer{    Scanline.alpha = 1.0;    [UIView beginanimations:@ "Scanline" context:nil];    [UIView setanimationduration:0.8];    [UIView setanimationcurve:uiviewanimationcurvelinear];    Scanline.alpha = 0.05;    [UIView commitanimations];}