scrollVie无限循环图片中定时器的两种方法

scrollview里面的循环的关键定时器的应用

启动定时器的两种方法

//1
//timerWithTimeInterval需要手工把timer加入到消息循环中
NSTimer *timer = [NSTimer timerWithTimeInterval:2.0 target:self selector:@selector(nextImage) userInfo:nil repeats:YES];

NSRunLoop *loop = [NSRunLoop currentRunLoop];
[loop addTimer:timer forMode:NSDefaultRunLoopMode];//这个方法仅仅是提前执行timer要执行的方法
//[timer fire];

//2
//scheduledTimerWithTimeInterval自动把timer加入到消息循环中
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:selfselector:@selector(nextImage) userInfo:nil repeats:YES];

//让图片自动播放- (void)nextImage{

int n = self.pageControl.currentPage;if (n == 5 - 1) {

n = 0;}else{

n = self.pageControl.currentPage + 1;}

//让scollView自己滚动

CGFloat offsetX = n * self.scrollView.frame.size.width;

[self.scrollView setContentOffset:CGPointMake(offsetX, 0) animated:YES];}