iOS Dev (31) 动画进阶之一

iOS Dev (31) 动画进阶之一

• 作者：CSDN 大锐哥
• 地址：http://blog.csdn.net/prevention

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说点废话

• 设置动画在 commitAnimations 之后的发生日期（感觉上一般不会跟 delay 一起使用）

    setAnimationStartDate
  

• 设置动画从 commitAnimation 之后延迟多久开始

    setAnimationDelay
  

• 设置动画持续的秒数

    setAnimationDuration
  

• 设置动画过程的相对速度

    setAnimationCurve
  

• 设置动画的重复次数

    setAnimationRepeatCount
  

• 设置动画到达目标值时是否自动反向播放

    setAnimationRepeatAutoreverses
  

• 设置是否激活动画

    setAnimationsEnabled
  

• 查看是否动画被激活

    areAnimationEnabled
  

上点代码

自己看看动画代码段吧：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    UIImageView *imageView1 = [[UIImageView alloc] initWithFrame:CGRectMake(0, 20, 100, 100)];
    imageView1.image = [UIImage imageNamed:@"gyy.jpg"];
    imageView1.backgroundColor = [UIColor yellowColor];
    imageView1.contentMode = UIViewContentModeScaleToFill;      // 充满
    [self.window addSubview:imageView1];
    imageView1.tag = 1;

    UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(10, 300, 200, 80)];
    btn.backgroundColor = [UIColor blueColor];
    [btn addTarget:self action:@selector(animate) forControlEvents:UIControlEventTouchUpInside];
    [self.window addSubview:btn];

    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

- (void)animate
{
    NSLog(@"haha");
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:10];
    [UIView setAnimationDelay:0];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    UIView *v = [self.window viewWithTag:1];
    v.frame = CGRectMake(100, 100, 200, 80);
    [UIView commitAnimations];
}

UIViewAnimationCurve

其中我们应该看到了 setAnimationCurve 方法，看看他都有哪些参数：

typedef NS_ENUM(NSInteger, UIViewAnimationCurve) {
    UIViewAnimationCurveEaseInOut,         // slow at beginning and end
    UIViewAnimationCurveEaseIn,            // slow at beginning
    UIViewAnimationCurveEaseOut,           // slow at end
    UIViewAnimationCurveLinear
};

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