将 uiimages 放在背景中

Question

这是我的代码：

-(void)transition
{

CATransition *applicationLoadViewIn = [CATransition animation];
[applicationLoadViewIn setDuration:2];
[applicationLoadViewIn setType:kCATransitionFade];
[applicationLoadViewIn setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]];
//on ajoute l animation au layer
[[self.view layer] addAnimation:applicationLoadViewIn forKey:kCATransitionFade];
//On configure notre nouvel image
int rand = arc4random() % 6;
switch (rand) {

    case 0: 
    imgView2 =   [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"pinkfont.png"]];          
        break;
    case 1:
       imgView2 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"greenfont.png"]];
        break;
    case 2:
     imgView2 =  [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"whitefont.png"]];
        break;
    case 3:
  imgView2 =  [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"yellowfont.png"]];
        break;
    case 4:
        imgView2 =  [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"purplefont.png"]];
        break;
    case 5:
        imgView2 =  [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bluefont.png"]];
        break;
}

/
if(self.view.layer.sublayers.count<=2)
    //premier cas on ajoute notre image
{
    [[[self view] layer] addSublayer:[imgView2 layer]];
    [self.view sendSubviewToBack:imgView2];

}
else {
    //deuxieme cas on supprime notre image
    [[self.view.layer.sublayers lastObject] removeFromSuperlayer];


}

[imgView2 release];
 }

- (void)viewDidLoad {
[super viewDidLoad];
UIImage *image2 = [UIImage imageNamed:@"belleouf2_03.png"];
int rand2 = arc4random() % 5;
switch (rand2) {
    case 0: 
        imgView =   [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"pinkfont.png"]];          
        break;
    case 1:
        imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"greenfont.png"]];
        break;
    case 2:
        imgView =  [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"whitefont.png"]];
        break;
    case 3:
        imgView =  [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"yellowfont.png"]];
        break;
    case 4:
        imgView =  [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"purplefont.png"]];
        break;
    case 5:
        imgView =  [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bluefont.png"]];
        break;
}

//On ajoute à la vue le layer avec notre image
[[[self view] layer] addSublayer:[imgView layer]];
[self.view sendSubviewToBack:imgView];

    [imgView release];
[NSTimer scheduledTimerWithTimeInterval:5.0 target:self selector:@selector(transition) userInfo:nil repeats:YES];

 }

我想要的是将 imgView 和 imgView2 放在背景上，但只有 imgView 位于背景并且这仅在开始时（viewDidLoad）。请问我该怎么做？抱歉我的英语我是法国人：/

Answer 1

好的，最简单的方法是在屏幕上显示两个图像视图。因此，在 Interface Builder 中，您将最后在底部显示图像。将它们全部堆叠在一起。然后使用 NSTimer 将图像视图设置为不可见。因此，如果将顶层设置为不可见，则第二个图像将变得可见，然后为了使第一个图像返回，请将顶部图像设置回可见，并且由于该图像位于顶部，因此它将显示为背景。希望这有帮助！