背景图像太大在窗口/视图中 [英] Background image too large in window/view
问题描述
我正在玩一个非常小的单一视图应用程序,以了解视图的工作方式。我是iOS开发的新手。我正在使用一张图片作为我唯一视图的背景。在运行应用程序时,我的背景是巨大的。就好像放大或缩放一样。我正在关注视图的Big Nerd Ranch教程,因此我使用了一个名为HypnosisView的UIView的子类。这是暂时的。我们也可能值得注意的是,我尝试用于背景的图像精确地为640 x 1136像素。
I am playing around with a very small single view application in order to understand how views work. I am extremely new to iOS development. I am using an image i put together as a background for my only view. When running the app my background is enormous. It's as if it is zoomed in or scaled. I am following a Big Nerd Ranch tutorial for views and as such I'm using a subclass of UIView called HypnosisView. This is temporary. It may also we worth noting that the image I am trying to use for a background is precisely 640 x 1136 pixels.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
CGRect viewFrame = CGRectMake(0, 0, 640, 1136);
HypnosisView *view = [[HypnosisView alloc] initWithFrame:viewFrame];
[view setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"BG.png"]]];
[[self window] addSubview:view];
self.window.backgroundColor = [UIColor blackColor];
[self.window makeKeyAndVisible];
return YES;
}
尝试使用0,0,320,568实现UIImageView的更新代码帧。我还创建了一个320大小的背景,然后是一个全尺寸的背景,并用适当的标题命名。
Updated code trying to implement a UIImageView using a 0, 0, 320, 568 frame. I also created a 320 sized background and then a full sized background and named them with the proper titles.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
CGRect viewFrame = CGRectMake(0, 0, 320, 568);
UIImage *background = [UIImage imageNamed:@"background@2x.png"];
UIImageView *backgroundView = [[[UIImageView alloc] initWithImage:background] initWithFrame:viewFrame];
[[self window] addSubview:backgroundView];
[[self window] sendSubviewToBack:backgroundView];
self.window.backgroundColor = [UIColor clearColor];
[self.window makeKeyAndVisible];
return YES;
}
推荐答案
如果您的视图框架较大如果屏幕太大,您的图像将被剪裁。您可以使用UIScrollView,缩小原始图像的大小或使用以下代码缩放图像:
If your view frame is larger than your screen, your image will be clipped if it too is bigger. You can either use a UIScrollView, shrink the original image down to size or scale your image with code like this:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
CGRect viewFrame = CGRectMake(0, 0, 320, 568);
UIImage *background = [UIImage imageNamed:@"BG.png"];
UIImage *scaledImage = [UIImage imageWithCGImage:[background CGImage]
scale:(background.scale * 2.0)
orientation:(background.imageOrientation)];
UIImageView *backgroundView = [[[UIImageView alloc] initWithImage:scaledImage] initWithFrame:viewFrame];
[[self window] addSubview:backgroundView];
[[self window] sendSubviewToBack:backgroundView];
self.window.backgroundColor = [UIColor clearColor];
[self.window makeKeyAndVisible];
return YES;
}
(我的比例系数基于640x1136的图像尺寸)
(my scale factor is based on an image size of 640x1136)
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