访问 iPad 以编程方式启动图像？

Question

我在 Images.xcassets 中使用 LaunchImage.launchimage 来管理启动图像。但我也在尝试使用应用程序内的启动图像。

我读过 this answer :

The documentation indicates that the imageNamed: method on UIImage should auto-magically select the correct version

所以，我使用了这段代码

UIImageView *backImage = [UIImageView new];
backImage.image = [UIImage imageNamed:@"LaunchImage"];

在 iPhone 4、5、6、6+ 上工作时，它工作得很好并获得正确的 LaunchImage，但是在 iPad retina[=35= 上工作时] 它 returns LaunchImage-700@2x.png 这是 iPhone 4s 640 x 960 pixels

的 LaunchImage
那么如何以编程方式访问 iPad 的正确 LaunchImage ??

LaunchImage 文件夹中 Contents.json 的内容

{ "images" : [ { "extent" : "full-screen", "idiom" : "iphone", "subtype" : "736h", "filename" : "LaunchImage-800-Portrait-736h@3x.png", "minimum-system-version" : "8.0", "orientation" : "portrait", "scale" : "3x" }, { "extent" : "full-screen", "idiom" : "iphone", "subtype" : "667h", "filename" : "LaunchImage-800-667h@2x.png", "minimum-system-version" : "8.0", "orientation" : "portrait", "scale" : "2x" }, { "orientation" : "portrait", "idiom" : "iphone", "extent" : "full-screen", "minimum-system-version" : "7.0", "filename" : "LaunchImage-700@2x.png", "scale" : "2x" }, { "extent" : "full-screen", "idiom" : "iphone", "subtype" : "retina4", "filename" : "LaunchImage-700-568h@2x.png", "minimum-system-version" : "7.0", "orientation" : "portrait", "scale" : "2x" }, { "orientation" : "portrait", "idiom" : "ipad", "extent" : "full-screen", "minimum-system-version" : "7.0", "filename" : "LaunchImage-700-Portrait~ipad.png", "scale" : "1x" }, { "orientation" : "landscape", "idiom" : "ipad", "extent" : "full-screen", "minimum-system-version" : "7.0", "filename" : "LaunchImage-700-Landscape~ipad.png", "scale" : "1x" }, { "orientation" : "portrait", "idiom" : "ipad", "extent" : "full-screen", "minimum-system-version" : "7.0", "filename" : "LaunchImage-700-Portrait@2x~ipad.png", "scale" : "2x" }, { "orientation" : "landscape", "idiom" : "ipad", "extent" : "full-screen", "minimum-system-version" : "7.0", "filename" : "LaunchImage-700-Landscape@2x~ipad.png", "scale" : "2x" }, { "orientation" : "portrait", "idiom" : "iphone", "extent" : "full-screen", "filename" : "LaunchImage-700.png", "scale" : "1x" }, { "orientation" : "portrait", "idiom" : "iphone", "extent" : "full-screen", "filename" : "LaunchImage-700@2x.png", "scale" : "2x" }, { "orientation" : "portrait", "idiom" : "iphone", "extent" : "full-screen", "filename" : "LaunchImage-700-568h@2x.png", "subtype" : "retina4", "scale" : "2x" }, { "orientation" : "portrait", "idiom" : "ipad", "extent" : "full-screen", "filename" : "LaunchImage-700-Portrait~ipad.png", "scale" : "1x" }, { "orientation" : "landscape", "idiom" : "ipad", "extent" : "full-screen", "filename" : "LaunchImage-700-Landscape~ipad.png", "scale" : "1x" }, { "orientation" : "portrait", "idiom" : "ipad", "extent" : "full-screen", "filename" : "LaunchImage-700-Portrait@2x~ipad.png", "scale" : "2x" }, { "orientation" : "landscape", "idiom" : "ipad", "extent" : "full-screen", "filename" : "LaunchImage-700-Landscape@2x~ipad.png", "scale" : "2x" } ], "info" : { "version" : 1, "author" : "xcode" } }

Answer 1

我认为这些扩展名（例如-700-Landscape@2x~ipad）无法识别。

将以下项目添加到您的 Contents.json 中仅用于测试目的：

{
      "orientation" : "landscape",
      "idiom" : "ipad",
      "extent" : "full-screen",
      "filename" : "LaunchImage.png",
      "scale" : "1x"
}

现在试试 imageNamed: 方法。

或尝试 imageNamed: 使用图像全名：

backImage.image = [UIImage imageNamed:@"LaunchImage-700-Landscape~ipad.png"];

Answer 2

LaunchImage.launchimage

您真的在使用 Images.xcassets 来管理启动图像吗？你不是用 LaunchImage.launchimage 代替吗？

如果是这样，就会出现混乱。您不能使用 [UIImage imageNamed:@"LaunchImage"]; 从 LaunchImage.launchimage.

加载

规范名称

LaunchImage.png
LaunchImage@2x.png
LaunchImage-700@2x.png
LaunchImage-568h@2x.png
LaunchImage-700-568h@2x.png
LaunchImage-700-Landscape@2x~ipad.png

LaunchImage-700-Portrait@2x~ipad.png 在该列表中不。

Answer 3

我已经用很长的方法解决了这个问题

BOOL deviceIsIpad = NO;
if ( UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad ) {
    deviceIsIpad = YES;
}

if (!deviceIsIpad) {
    backImage.image = [UIImage imageNamed:@"LaunchImage"];
} else {
    UIInterfaceOrientation interfaceOrientation = self.interfaceOrientation;
    CGFloat screenScale = [[UIScreen mainScreen] scale];
    if (interfaceOrientation == UIDeviceOrientationPortrait || interfaceOrientation == UIDeviceOrientationPortraitUpsideDown){
        if (screenScale > 1) {
            backImage.image = [UIImage imageNamed:@"LaunchImage-700-Portrait@2x~ipad.png"];
        } else {
            backImage.image = [UIImage imageNamed:@"LaunchImage-700-Portrait~ipad.png"];
        }
    } else {
        if (screenScale > 1) {
            backImage.image = [UIImage imageNamed:@"LaunchImage-700-Landscape@2x~ipad.png"];
        } else {
            backImage.image = [UIImage imageNamed:@"LaunchImage-700-Landscape~ipad.png"];
        }
    }
}

访问 iPad 以编程方式启动图像？

Access iPad launch images programmatically?

cocoa-touch

objective-c

ipad

ios

launchimage

那么如何以编程方式访问 iPad 的正确 LaunchImage ??