ios uiview添加阴影 ios uiview animation

转载

网线小游侠 2023-10-18 18:15:58

文章标签 ios uiview添加阴影 ios 游戏动画效果开发者 文章分类 iOS 移动开发

@interface UIView(UIViewAnimation)

+ (void)beginAnimations:(NSString *)animationID context:(void *)context;  // additional context info passed to will start/did stop selectors. begin/commit can be nested
+ (void)commitAnimations;                                                 // starts up any animations when the top level animation is commited

// no getters. if called outside animation block, these setters have no effect.
+ (void)setAnimationDelegate:(id)delegate;                          // default = nil
+ (void)setAnimationWillStartSelector:(SEL)selector;                // default = NULL. -animationWillStart:(NSString *)animationID context:(void *)context
+ (void)setAnimationDidStopSelector:(SEL)selector;                  // default = NULL. -animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context
+ (void)setAnimationDuration:(NSTimeInterval)duration;              // default = 0.2
+ (void)setAnimationDelay:(NSTimeInterval)delay;                    // default = 0.0
+ (void)setAnimationStartDate:(NSDate *)startDate;                  // default = now ([NSDate date])
+ (void)setAnimationCurve:(UIViewAnimationCurve)curve;              // default = UIViewAnimationCurveEaseInOut
+ (void)setAnimationRepeatCount:(float)repeatCount;                 // default = 0.0.  May be fractional
+ (void)setAnimationRepeatAutoreverses:(BOOL)repeatAutoreverses;    // default = NO. used if repeat count is non-zero
+ (void)setAnimationBeginsFromCurrentState:(BOOL)fromCurrentState;  // default = NO. If YES, the current view position is always used for new animations -- allowing animations to "pile up" on each other. Otherwise, the last end state is used for the animation (the default).

+ (void)setAnimationTransition:(UIViewAnimationTransition)transition forView:(UIView *)view cache:(BOOL)cache;  // current limitation - only one per begin/commit block

+ (void)setAnimationsEnabled:(BOOL)enabled;                         // ignore any attribute changes while set.
+ (BOOL)areAnimationsEnabled;

@end

这些方法非常的不直观，开发者还是需要花很多时间去思考怎么组合这些方法。但是自从iOS4.0提供块语法支持之后，苹果公司把动画效果的实现封装了一下，效果立杆见影，直观了许多，因此大家完全可以不用去看上面的那些方法，重点关注如下的方法：

@interface UIView(UIViewAnimationWithBlocks)

+ (void)animateWithDuration:(NSTimeInterval)duration 
					  delay:(NSTimeInterval)delay 
					  options:(UIViewAnimationOptions)options 
					  animations:(void (^)(void))animations 
					  completion:(void (^)(BOOL finished))completion;

+ (void)animateWithDuration:(NSTimeInterval)duration 
				  animations:(void (^)(void))animations 
				  completion:(void (^)(BOOL finished))completion 
				  NS_AVAILABLE_IOS(4_0); // delay = 0.0, options = 0

+ (void)animateWithDuration:(NSTimeInterval)duration 
				  animations:(void (^)(void))animations
				  NS_AVAILABLE_IOS(4_0); // delay = 0.0, options = 0, completion = NULL

+ (void)transitionWithView:(UIView *)view 
				   duration:(NSTimeIntervl)duration 
				   options:(UIViewAnimationOptins)options 
				   animations:(void (^)(void)animations 
				   completion:(void (^)(BOOL finished)				   completion 
				   NS_AVAILABLE_IOS(4_0);

+ (void)transitionFromView:(UIView *)fromView 
				     toView:(UIView *)toView 
				     duration:(NSTimeInterval)duration 
				     options:(UIViewAnimationOptions)options 
				     completion:(void (^)(BOOL finished))completion
				     NS_AVAILABLE_IOS(4_0); // toView added to fromView.superview, fromView removed from its superview

@end

上面的几个方法从名字上看就非常直观。前三个方法都可以按如下的方式直译，只是后两个使用了一些默认参数而已：

做一个动画效果，持续时间为duration, 
				延迟delay秒开始执行 ，
				以options指定的方式运行这个动画，
				animations块中指定哪些UIView会参加本次动画效果，以及动画效果完成时这些UIView会是一个什么状态，				
				动画完成之后，执行completion块进行收尾。

有了这3个方法，开发者只需要思考，初始值，结果值，持续时间，运行方式就行了，具体的细节移动都交给类库。

后2个方法是用于UIView相互之间转换的，个人觉得用处不大，因为用上面的三个方法同样可以做到这些效果，因此略过。

关于UIView的动画效果支持，有2点值得一提

* 上面所有的方法都是类方法，当调用这些方法之后，系统会新起线程执行动画效果，不会阻塞主线程的执行。

* UIView的Animation效果只支持一些简单的2D动画效果，复杂的大家还得研究Core Animation。

[b]一个实战例子[/b]

在我写的一个小游戏的主机界面中，我使用了一点动画的效果，主界面的设计图如下：

[img]http://dl2.iteye.com/upload/attachment/0086/5659/9defc401-e516-3818-adb2-0de92e55ff2d.png[/img]

动画后的效果图如下：

[img]http://dl2.iteye.com/upload/attachment/0086/5661/41dee19b-4fe7-36a6-b4ec-c6d41bbe82a2.png[/img]

我想要的效果就是，加载主界面后，图片缓缓的展开成扇形，然后游戏的菜单显示供玩家点击。

代码如下：

首先，准备动画前状态,让想展示的UIView不可见：

-(void) prepareForIntroAnimation
{
    self.sImageView.hidden=YES;
    self.nImageView.hidden=YES;
    self.aImageView.hidden=YES;
    self.pImageView.hidden=YES;
    self.jokerImageView.hidden=YES;

    self.hostGameButton.alpha=0.0f;
    self.joinGameButton.alpha=0.0f;
    self.singlePlayerGameButton.alpha=0.0f;
    self.helpButton.alpha=0.0f;
    _buttonsEnabled = NO;
}

然后，展示动画效果：

-(void) performAnimation
{
	//显示UIView
    self.sImageView.hidden=NO;
    self.nImageView.hidden=NO;
    self.aImageView.hidden=NO;
    self.pImageView.hidden=NO;
    self.jokerImageView.hidden=NO;

    [UIView animateWithDuration:0.65f
                          delay:0.5f
                        options:UIViewAnimationOptionCurveEaseIn
                     animations:^
     {
     	  //确定UIView的的中心位置和偏转角度
         self.sImageView.center = CGPointMake(80.0f, 108.0f);
         self.sImageView.transform = CGAffineTransformMakeRotation(-0.22f);

         self.nImageView.center = CGPointMake(160.0f, 93.0f);
         self.nImageView.transform = CGAffineTransformMakeRotation(-0.1f);

         self.aImageView.center = CGPointMake(240.0f, 88.0f);

         self.pImageView.center = CGPointMake(320.0f, 93.0f);
         self.pImageView.transform = CGAffineTransformMakeRotation(0.1f);

         self.jokerImageView.center = CGPointMake(400.0f, 108.0f);
         self.jokerImageView.transform = CGAffineTransformMakeRotation(0.22f);
     }
                     completion:nil];

    [UIView animateWithDuration:0.5f
                          delay:1.0f
                        options:UIViewAnimationOptionCurveEaseOut
                     animations:^
     {
         //透明度设置为1，显示游戏菜单。
         self.hostGameButton.alpha = 1.0f;
         self.joinGameButton.alpha = 1.0f;
         self.singlePlayerGameButton.alpha = 1.0f;
         self.helpButton.alpha = 1.0f;
     }
                     completion:^(BOOL finished)
     {
         _buttonsEnabled = YES;
     }];

}

另外，动画效果还可以使用completion的回调块做连接，完成多个动画效果的连接。

本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。