iphone - 启动应用程序后，如何从 Default.png 淡入？

Question

启动 iOS 应用程序时，屏幕从 Default.png 跳转到界面。对于当前的项目，我想从 Default.png 淡入到应用程序的界面中。有什么好的方法吗？

Answer 1

我引用了一些 rooster117 和 runmad 的答案，这就是我想出的。

将 UIImageView 添加到第一个 UIViewController 的属性中:

@interface DDViewController : UIViewController {
   ...
    UIImageView *coverImageView;
}

...

@property (nonatomic, retain) UIImageView *coverImageView;

然后，对于 iPad 应用程序的“主屏幕”，我调用如下:

- (void)viewDidLoad
{
    [super viewDidLoad];

    ...

    coverImageView = [[UIImageView alloc] init];
}

-(void)viewWillAppear:(BOOL)animated {
    UIImage *defaultImage;   
    if (UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation)) {
        NSLog(@"Landscape!");
        defaultImage = [UIImage imageNamed:@"Default-Landscape.png"];
    } else {
        NSLog(@"Portrait!");
        defaultImage = [UIImage imageNamed:@"Default-Portrait.png"];
    }

    coverImageView = [[UIImageView alloc] initWithImage:defaultImage];
    [self.view addSubview:coverImageView];

}

-(void)viewDidAppear:(BOOL)animated {
    //Remove the coverview with an animation
    [UIView animateWithDuration:1.0f animations:^(void) {
        [self.coverImageView setAlpha:0.0];
    } completion:^(BOOL finished){
        [coverImageView removeFromSuperview];
    }];
}