iOS启动动画效果实现

原理

在window上加一个UIImageView它的图片和启动图的图片一样，然后再调整动画

运行展示

demo百度云连接:http://pan.baidu.com/s/1c0QcYu0

more：网上看了一个哥们的封装的还不错，分析下代码：

宏定义

#define iphone4x_3_5 ([UIScreen mainScreen].bounds.size.height==480.0f)

#define iphone5x_4_0 ([UIScreen mainScreen].bounds.size.height==568.0f)

#define iphone6_4_7 ([UIScreen mainScreen].bounds.size.height==667.0f)

#define iphone6Plus_5_5 ([UIScreen mainScreen].bounds.size.height==736.0f || [UIScreen mainScreen].bounds.size.height==414.0f)

获取启动图片，你创建的图片资源文件里面的

/**
 *  获取启动图片
 */
+(UIImage *)launchImage{
    
    NSString *imageName=@"LaunchImage-700";
    
    if(iphone5x_4_0) imageName=@"LaunchImage-700-568h";
    
    if(iphone6_4_7) imageName = @"LaunchImage-800-667h";
    
    if(iphone6Plus_5_5) imageName = @"LaunchImage-800-Portrait-736h";
    
    UIImage *image = [UIImage imageNamed:imageName];
    
    NSAssert(image != nil, @"Charlin Feng提示您：请添加启动图片！");
    
    return image;
}

设置动画根据需要合一随意变的（这里它就是添加到控制器上面的）

+(void)animWithWindow:(UIWindow *)window image:(UIImage *)image{
    
    UIImageView *imageV = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    
    imageV.image = image==nil?[self launchImage]:image;
    
    [window.rootViewController.view addSubview:imageV];
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        
        
        [UIView animateWithDuration:1.5 animations:^{
            
            [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
            
            imageV.transform=CGAffineTransformMakeScale(1.5, 1.5);
            imageV.alpha = 0;
        } completion:^(BOOL finished) {
            
            [imageV removeFromSuperview];
            
        }];
        
    });
}

调用（ok）

    [WJLaunchImage animWithWindow:self.window image:nil];