image - 如何在 UIView 上拉伸(stretch)(缩放)图像？

Question

如何在我的 UIView (320/460) 上拍摄图像并将其拉伸(stretch)以填满屏幕

我正在加载和放置它，但是如您所见，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 的帖子的评论中所说的那样，UIImageView 需要一个大小来知道要拉伸(stretch)到哪里。这里我使用了相同大小的 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];