使用UIImageView播放动画

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问题：如何使用UIImageView播放动画，并停留在之后一张图片
思路：
除了把动画所需要的几张图片赋值给 animationImages 之外，
多加一步，把最后一张图片赋值给UIImageView的 Image就好了。
让后就开始Animations。
代码如下：
UIImageView *fishAni=[[UIImageView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    //将指定的图片载入 animationImages
    fishAni.animationImages=[NSArray arrayWithObjects:
                             [UIImage imageNamed:@"13.png"],
                             [UIImage imageNamed:@"12.png"],
                             [UIImage imageNamed:@"11.png"],
                             [UIImage imageNamed:@"10.png"],nil ];
    [fishAni setImage:[UIImage imageNamed:@"10.png"]];
    
    //设定动画的播放时间
    fishAni.animationDuration=1.0;
    //设定重复播放次数
    fishAni.animationRepeatCount=1;
    
    //开始播放动画
    [fishAni startAnimating];
    
    [self.view addSubview:fishAni];
 
 当播放器播放完后，要执行的事件，可以添加如下代码：
    NSInteger AnimationNtimer =1;
NSTimer *animationTimer = [NSTimer scheduledTimerWithTimeInterval: AnimationNtimer target:self selector:@selector(ArrowAnimationPlay:) userInfo:nil repeats: NO];
 播放结束后的事件。
-(void)ArrowAnimationPlay:(NSTimer *) timer{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"wtq" message:@"I have a message" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:nil];
[alert show];
[alert release];
}
颜色变换:
做一个UIImage的category，直接上代码：
- (UIImage *) imageWithBackgroundColor:(UIColor *)bgColor   
                           shadeAlpha1:(CGFloat)alpha1   
                           shadeAlpha2:(CGFloat)alpha2  
                           shadeAlpha3:(CGFloat)alpha3   
                           shadowColor:(UIColor *)shadowColor   
                          shadowOffset:(CGSize)shadowOffset   
                            shadowBlur:(CGFloat)shadowBlur {   
    UIImage *image = self;  
    CGColorRef cgColor = [bgColor CGColor];  
    CGColorRef cgShadowColor = [shadowColor CGColor];  
    CGFloat components[16] = {1,1,1,alpha1,1,1,1,alpha1,1,1,1,alpha2,1,1,1,alpha3};  
    CGFloat locations[4] = {0,0.5,0.6,1};  
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();    
    CGGradientRef colorGradient = CGGradientCreateWithColorComponents(colorSpace, components, locations, (size_t)4);  
    CGRect contextRect;  
    contextRect.origin.x = 0.0f;  
    contextRect.origin.y = 0.0f;  
    contextRect.size = [image size];  
    //contextRect.size = CGSizeMake([image size].width+5,[image size].height+5);    
    // Retrieve source image and begin image context  
    UIImage *itemImage = image;  
    CGSize itemImageSize = [itemImage size];  
    CGPoint itemImagePosition;   
    itemImagePosition.x = ceilf((contextRect.size.width - itemImageSize.width) / 2);  
    itemImagePosition.y = ceilf((contextRect.size.height - itemImageSize.height) / 2);  
    UIGraphicsBeginImageContext(contextRect.size);  
    CGContextRef c = UIGraphicsGetCurrentContext();  
    // Setup shadow  
    CGContextSetShadowWithColor(c, shadowOffset, shadowBlur, cgShadowColor);  
    // Setup transparency layer and clip to mask  
    CGContextBeginTransparencyLayer(c, NULL);  
    CGContextScaleCTM(c, 1.0, -1.0);  
    CGContextClipToMask(c, CGRectMake(itemImagePosition.x, -itemImagePosition.y, itemImageSize.width, -itemImageSize.height), [itemImage CGImage]);  
    // Fill and end the transparency layer  
    CGContextSetFillColorWithColor(c, cgColor);       
    contextRect.size.height = -contextRect.size.height;  
    CGContextFillRect(c, contextRect);  
    CGContextDrawLinearGradient(c, colorGradient,CGPointZero,CGPointMake(contextRect.size.width*1.0/4.0,contextRect.size.height),0);  
    CGContextEndTransparencyLayer(c);  
    //CGPointMake(contextRect.size.width*3.0/4.0, 0)  
    // Set selected image and end context  
    UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();  
    UIGraphicsEndImageContext();  
    CGColorSpaceRelease(colorSpace);  
    CGGradientRelease(colorGradient);  
    return resultImage;  
}  
用法如下：
UIImage *niceImage = [[UIImage imageNamed:@"image_name"] imageWithBackgroundColor:[UIColor colorWithRed:41.0/255.0 green:147.0/255.0 blue:239.0/255.0 alpha:1.0]   
                                                                      shadeAlpha1:0.6   
                                                                      shadeAlpha2:0.0   
                                                                      shadeAlpha3:0.4   
                                                                      shadowColor:[UIColor blackColor]   
                                                                     shadowOffset:CGSizeMake(0.0f, -1.0f)    
                                                                       shadowBlur:3.0];   