滚动视图在彼此顶部添加视图

Question

我可以添加多个滚动视图，其背景颜色已更改并且工作正常。所以基本上对于每个视图你有不同的背景颜色。但是，当我尝试为每个视图添加单独的视图时，它会将视图添加到另一视图的顶部，我不知道为什么。

UIViewController *view1 = [self.storyboard instantiateViewControllerWithIdentifier:@"View1"]; 
UIViewController *view2 = [self.storyboard instantiateViewControllerWithIdentifier:@"View2"]; 
UIViewController *view3 = [self.storyboard instantiateViewControllerWithIdentifier:@"View3"]; 


for (NSInteger i=0; i<ScrollViewControllerNumberOfPages; i++) { 
    CGFloat yOrigin = i * self.view.frame.size.height; 
    CGRect subViewFrame = CGRectMake(yOrigin, 0, pageHeight, pageWidth); 
    NSLog(@"Printing Width and Height %f %f",pageWidth,pageHeight); 
    UIView *subView = [[UIView alloc] initWithFrame:subViewFrame]; 

    // Pick a random colour for the view 
    CGFloat randomRed = ((CGFloat)(arc4random() % 1000))/1000; 
    CGFloat randomGreen = ((CGFloat)(arc4random() % 1000))/1000; 
    CGFloat randomBlue = ((CGFloat)(arc4random() % 1000))/1000; 
    subView.backgroundColor = [UIColor colorWithRed:randomRed green:randomGreen blue:randomBlue alpha:1]; 
    NSLog(@"printin i %i", i); 
    if (i == 0) 
    subView = view1.view; 
    else if (i == 1) 
     subView = view2.view; 
[self.scrollView addSubview:subView]; 
} 

Answer 1

这是在黑暗中拍摄的，因为你的代码需要一些认真的反思。

你正在做什么是你分配一个subview，修改它的框架和背景，然后完全无视这一点，它设置为先前已实例viewcontoller视图。

这应该工作（的方式）：

UIViewController *view1 = [self.storyboard instantiateViewControllerWithIdentifier:@"View1"]; 
UIViewController *view2 = [self.storyboard instantiateViewControllerWithIdentifier:@"View2"]; 
UIViewController *view3 = [self.storyboard instantiateViewControllerWithIdentifier:@"View3"]; 

for (NSInteger i=0; i<ScrollViewControllerNumberOfPages; i++) { 
    CGFloat yOrigin = i * self.view.frame.size.height; 
    CGRect subViewFrame = CGRectMake(yOrigin, 0, pageHeight, pageWidth); 
    NSLog(@"Printing Width and Height %f %f",pageWidth,pageHeight); 

    UIView *subView; 

    if (i == 0) 
     subView = view1.view; 
    else if (i == 1) 
     subView = view2.view; 

    subView.frame = subViewFrame; 

    // Pick a random colour for the view 
    CGFloat randomRed = ((CGFloat)(arc4random() % 1000))/1000; 
    CGFloat randomGreen = ((CGFloat)(arc4random() % 1000))/1000; 
    CGFloat randomBlue = ((CGFloat)(arc4random() % 1000))/1000; 
    subView.backgroundColor = [UIColor colorWithRed:randomRed green:randomGreen blue:randomBlue alpha:1]; 
    NSLog(@"printin i %d", i); 
    [self.scrollView addSubview:subView]; 
} 

它看起来有点更好，如果你不喜欢它：

for (NSInteger i=0; i<ScrollViewControllerNumberOfPages; i++) { 
    CGFloat yOrigin = i * self.view.frame.size.height; 
    CGRect subViewFrame = CGRectMake(yOrigin, 0, pageHeight, pageWidth); 
    NSLog(@"Printing Width and Height %f %f",pageWidth,pageHeight); 

    UIViewController *subViewCont = [self.storyboard instantiateViewControllerWithIdentifier:[NSString stringWithFormat:@"View%d",i+1]]; 

    UIView *subView = subViewCont.view; 

    subView.frame = subViewFrame; 

    // Pick a random colour for the view 
    CGFloat randomRed = ((CGFloat)(arc4random() % 1000))/1000; 
    CGFloat randomGreen = ((CGFloat)(arc4random() % 1000))/1000; 
    CGFloat randomBlue = ((CGFloat)(arc4random() % 1000))/1000; 
    subView.backgroundColor = [UIColor colorWithRed:randomRed green:randomGreen blue:randomBlue alpha:1]; 
    NSLog(@"printin i %d", i); 
    [self.scrollView addSubview:subView]; 
}