iphone用Animation兑现动画效果

iphone用Animation实现动画效果
1、写了一个小Demo，实现上下移动的效果图： iphone用Animation兑现动画效果

主要代码如下：

- (IBAction)upChange:(id)sender {    if (typeView == down) {        [self.downBtn setHidden:NO];        [self.upBtn setHidden:NO];        [UIView animateWithDuration:0.5 animations:^{            self.upView.center = CGPointMake(self.upView.center.x, 0);             self.downView.center = CGPointMake(self.downView.center.x, (self.upView.frame.size.height+self.downView.frame.size.height)/2);        }];                typeView = middle;    }else if(typeView == middle){        [self.downBtn setHidden:NO];        [self.upBtn setHidden:YES];        [UIView animateWithDuration:0.5 animations:^{            self.upView.center = CGPointMake(self.upView.center.x, -(self.upView.frame.size.height/2));            self.downView.center = CGPointMake(self.downView.center.x, self.downView.frame.size.height/2);        }];                typeView = up;    }}- (IBAction)downChange:(id)sender {    if (typeView == middle) {        [self.downBtn setHidden:YES];        [self.upBtn setHidden:NO];        [UIView animateWithDuration:0.5 animations:^{            self.upView.center = CGPointMake(self.upView.center.x, self.upView.frame.size.height/2);             self.downView.center = CGPointMake(self.downView.center.x, self.upView.frame.size.height+self.downView.frame.size.height/2);        }];        typeView = down;    }else if(typeView == up)    {        [self.downBtn setHidden:NO];        [self.upBtn setHidden:NO];        [UIView animateWithDuration:0.5 animations:^{            self.upView.center = CGPointMake(self.upView.center.x, 0);            self.downView.center = CGPointMake(self.downView.center.x, (self.upView.frame.size.height+self.downView.frame.size.height)/2);        }];                typeView = middle;    }}

这是主要的代码，另外还有一些需要注意的一些小细，如你的两个view的大小，需要计算出精确位置。
下面开始学习[UIView animateWithDuration]方法的使用：函数原型：

+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_4_0); // delay = 0.0, options = 0, completion = NULL

duration：动画持续时间animations：该代码儿块中是所有view要完成的动画的所有属性的定义；还有另外两个函数：

+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_4_0);

+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion__OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_4_0);// delay = 0.0, options = 0

options:是动画执行的选项completion：是动画完成以后所要执行的代码块儿。如需要源码，源码下载地址http://download.csdn.net/detail/rhljiayou/4922322

iphone用Animation兑现动画效果

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