iphone - 使iOS中的过渡动画持续时间更长

Question

我有一个从 UIViewController 到 UITabBarViewController 的转换，转换工作完美，但所需的时间太快，无法欣赏效果。所以我想知道是否有办法让这个过渡动画持续更长时间？

这是我的 AppDelegate.m

@implementation AppDelegate

@synthesize window = _window;
@synthesize tabBarController = _tabBarController;
@synthesize LoadingViewController = _LoadingViewController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

     self.window.rootViewController = self.LoadingViewController;
    [self.window addSubview:tabBarController.view];
    [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(changeView) userInfo:nil repeats:NO];


    [self.window makeKeyAndVisible];
    return YES;
}

-(void)changeView{

    self.tabBarController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; 



    [self.window.rootViewController presentModalViewController:self.tabBarController animated:YES];
}

这段代码在我的两个 Controller 之间进行转换。首先是我的 ViewController，2 秒后是我的 TabBarViewController。但正如我所说，这个动画进展得太快了。

Answer 1

使用此代码...

-(void)changeView{

  //  self.tabBarController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; 
       CATransition *animation = [CATransition animation];
        [animation setDelegate:self];   
        [animation setType:kCATransitionFade];
        [animation setDuration:0.5];// increase time duration with your requirement
        [animation setTimingFunction:[CAMediaTimingFunction functionWithName:
                                      kCAMediaTimingFunctionEaseInEaseOut]];
        [[self.window layer] addAnimation:animation forKey:@"transitionViewAnimation"];


   self.window.rootViewController = self.tabBarController;
   [self.window makeKeyAndVisible];
}