如何在UIView上拉伸（缩放）图像？

Question

如何拍摄图像并将其拉伸以填充UIView（320/460）

上的屏幕

我正在加载并放置它，但正如您所看到的，需要进行一些缩放。

谢谢！

CGRect gameArea = CGRectMake(0, 0, 320, 460);

UIImage *backgroundImage = [UIImage imageNamed:@"green_background.jpg"]; 
UIImageView *myImageView = [[UIImageView alloc] initWithImage:backgroundImage];
[myImageView setContentMode:UIViewContentModeScaleToFill];

UIView *topView = [[UIView alloc] initWithFrame:gameArea];

[topView addSubview:myImageView];    

[[self view] addSubview:topView];

Answer 1

就像我在上面对Shamsiddin的帖子中所说的那样，UIImageView需要一个大小才能知道要拉伸到哪里。在这里，我使用的是相同尺寸的UIView。我添加了另一个答案，因为缺少UIView的代码。所以这是完整的代码。

// Area of the UIView and UIImageView
CGRect gameArea = CGRectMake(0, 0, 320, 460);

// Create UIImageView with Image
UIImage *backgroundImage = [UIImage imageNamed:@"green_background.jpg"]; 
UIImageView *myImageView = [[UIImageView alloc] initWithFrame:gameArea];
[myImageView setImage:[backgroundImage stretchableImageWithLeftCapWidth:3 topCapHeight:3]]; 
[myImageView setUserInteractionEnabled:YES];

// Create UIView and insert subview
UIView *topView = [[UIView alloc] initWithFrame:gameArea];
[topView addSubview:myImageView];    
[[self view] addSubview:topView];

Answer 2

CGRect gameArea = CGRectMake(0, 0, 320, 460);

UIImage *backgroundImage = [UIImage imageNamed:@"green_background.jpg"]; 
UIImageView *myImageView = [[UIImageView alloc] initWithFrame:gameArea];
[myImageView setImage:[backgroundImage stretchableImageWithLeftCapWidth:3 topCapHeight:3]]; 
[myImageView setUserInteractionEnabled:YES];
[self.view addSubview:myImageView];

Answer 3

尝试

UIView *view;
view.ContentMode = UIViewContentModeScaleToFill;

Answer 4

我刚刚在我自己的iOS5应用程序中执行此操作，我需要动态设置背景图像并进行缩放。想象一下，你是在- (void)viewWillAppear:(BOOL) animated

中这样做的

UIImageView *imageview = [[UIImageView alloc] initWithFrame:self.view.frame];
[imageview setContentMode:UIViewContentModeScaleAspectFill];
[imageview setImage:[UIImage imageNamed:@"Background.png"]];
[self.view addSubview:imageview];
[self.view sendSubviewToBack:imageview];

所以我们创建视图，设置它的缩放模式，添加bg图像，在主视图中将其设置为子视图，然后将其推到后面，这样它就不会占用任何其他子视图。

请接受这个答案。