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从iPhone默认位图淡入主应用程序

uikit cocoa-touch iphone

1

sehugg · 技术社区 · 15 年前

执行渐变(0.5秒)的最简单/最快/最有效方法是什么 Default.png 到初始应用程序视图?

我的初次尝试,效果不太好。现在是星期六晚上,我们看看能不能做得更好。)

UIImageView* whiteoutView = [[UIImageView alloc] initWithFrame:self.view.frame]; // dealloc this later ??
whiteoutView.image = [UIImage imageNamed:@"Default.png"];
whiteoutView.alpha = 1.0;
[self.view.frame addSubview:whiteoutView];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDelay:0.5];
whiteoutView.alpha = 0;
[UIView commitAnimations];

3 回复 | 直到 15 年前

1

Stefan Arentz 15 年前

如何:

UIImageView* whiteoutView = [[[UIImageView alloc] initWithFrame:self.view.frame] autorelease];
if (whiteoutView != nil)
{
    whiteoutView.image = [UIImage imageNamed:@"Default.png"];
    [self.view addSubview:whiteoutView];

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration: 0.5];
    whiteoutView.alpha = 0.0;
    [UIView commitAnimations];
}

(您出错的是setAnimationDelay与setAnimationDuration,未正确释放视图,并尝试将视图添加到self.view.frame而不是self.view。编译器应该捕获最后一个。这样做了吗?)

2

1

joshrl 15 年前

这是一个简单的视图控制器,它淡出默认图像并从视图层次中移除自身。这种方法的优点是,您可以在不修改现有视图控制器的情况下使用它…

@interface LaunchImageTransitionController : UIViewController {}
@end
@implementation LaunchImageTransitionController

- (void)viewDidLoad {
  [super viewDidLoad];

  self.view = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Default.png"]] autorelease];
  [UIView beginAnimations:nil context:nil];
  [UIView setAnimationDuration:.5];
  [UIView setAnimationDelegate:self];
  [UIView setAnimationDidStopSelector:@selector(imageDidFadeOut:finished:context:)];
  self.view.alpha = 0.0;
  [UIView commitAnimations];

}
- (void)imageDidFadeOut:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context
{
  [self.view removeFromSuperview];
  //NOTE: This controller will automatically be released sometime after its view is removed from it' superview...
}
@end

以下是您在应用程序代理中使用它的方法:

- (void)applicationDidFinishLaunching:(UIApplication *)application {    

  //create your root view controller, etc...
  UIViewController *rootController = ....

  LaunchImageTransitionController *launchImgController = [[[LaunchImageTransitionController alloc] init] autorelease];

  [window addSubview:rootController.view];
  [window addSubview:launchImgController.view];

  [window makeKeyAndVisible];
}

3

0

David Kanarek 15 年前

除了使用 setAnimationDelay: 而不是 setAnimationDuration: 看起来不错。你觉得结果怎么样?

编辑:哇,使劲打。