#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) CADisplayLink *displayLink;

@property (nonatomic, assign) int count;

@end

@implementation ViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    // 创建CADisplayLink

    self.displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(displayLinkEvent)];

    [self performSelector:@selector(eventOne) withObject:nil afterDelay:];

    // 一秒后销毁

    [self performSelector:@selector(eventTwo) withObject:nil afterDelay:];

}

- (void)eventTwo

{

    [self.displayLink invalidate];

}

- (void)eventOne

{

    // 添加到循环圈（开始执行）

    [self.displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

}

- (void)displayLinkEvent

{

    self.count++;

    NSLog(@"%i",self.count);

}

@end