//  mainViewController.m
//  雪花
//
//  Created by pg on 14-5-20.
//  Copyright (c) 2014年 mqd. All rights reserved.
//

#import “mainViewController.h”

@interface mainViewController ()
//游戏时钟
@property(strong,nonatomic)CADisplayLink *gameTime;
//时钟戳记
@property(assign,nonatomic) CFTimeInterval startTime;
@end

@implementation mainViewController

– (void)viewDidLoad

{
    
    [super viewDidLoad];
    //初始化时间撮箕
    self.startTime = 0;
    //1,实例化游戏时钟
    self.gameTime = [CADisplayLink displayLinkWithTarget:self selector:@selector(updateTime:)];
    //2，添加到主运行循环
    
    [self.gameTime addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
    
    
    
}
    
    -(void)updateTime:(CADisplayLink *)sender{
    
        if (self.startTime == 0) {
            self.startTime = sender.timestamp;
        }
        
        CFTimeInterval deleTime = sender.timestamp – self.startTime;
        if (deleTime > 1.0) {
            NSLog(@”触发了”);
            self.startTime = sender.timestamp;
        }
        
    }

@end

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