NSTimer *timer;

CADisplayLink *caDisplayLink;

int timeCount;

- (void)viewDidLoad {

[super viewDidLoad];

// NSTimer定时器，创建之后就开始执行。适合后台的数据计算

timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(update:) userInfo:nil repeats:YES];

// CADisplayLink创建之后不会马上执行，需要加入到运行循环中才能执行 默认一秒执行60次

caDisplayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(display:)];

caDisplayLink.frameInterval = 60; // 1秒执行一次

[caDisplayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

}

-(void)display:(CADisplayLink *)t

{

timeCount++;

NSLog(@"COUNT = %i",timeCount);

if(timeCount>=10)

{

// 销毁定时器

[caDisplayLink invalidate];

caDisplayLink = nil;

}

}

-(void)update:(NSTimer *)t

{

timeCount++;

NSLog(@"COUNT = %i",timeCount);

if(timeCount>=10)

{

// 销毁定时器

[timer invalidate];

timer = nil;

}

}