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： 
   
   
 
 
主要代码如下：
[cpp]
- (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;  
    }  
  
}  
 
- (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 (

补充：移动开发 , IOS ,