在iOS 8上,Apple让我们可以直接从我们的应用程序转到App Settings,使用Constant UIApplicationOpenSettingsURLString
UIApplication.sharedApplication().openURL(NSURL.URLWithString(UIApplicationOpenSettingsURLString))
有一个代码可以测试iOS 7上是否存在此常量,但它使用了ObjC和pointes。 Apple在他们的代码上执行了此操作:https://developer.apple.com/library/ios/samplecode/AppPrefs/Listings/RootViewController_m.html
如何使用Swift制作这样的东西?
答案 0 :(得分:21)
在斯威夫特:
switch UIDevice.currentDevice().systemVersion.compare("8.0.0", options: NSStringCompareOptions.NumericSearch) {
case .OrderedSame, .OrderedDescending:
UIApplication.sharedApplication().openURL(NSURL.URLWithString(UIApplicationOpenSettingsURLString))
case .OrderedAscending:
//Do Nothing.
}
在Objective-C中:
if (&UIApplicationOpenSettingsURLString != NULL) {
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
}
答案 1 :(得分:1)
与检查Constant不同,但如果您知道包含Constant的API版本(在我的情况下是iOS 8),则有一些技巧:http://nshipster.com/swift-system-version-checking/
其中一个是:
switch UIDevice.currentDevice().systemVersion.compare("8.0.0", options: NSStringCompareOptions.NumericSearch) {
case .OrderedSame, .OrderedDescending:
println("iOS >= 8.0")
case .OrderedAscending:
println("iOS < 8.0")
}
答案 2 :(得分:1)
您可以使用#available:
if #available(iOS 8.0, *) {
UIApplication.sharedApplication().openURL(NSURL(string: UIApplicationOpenSettingsURLString)!);
} else {
// Fallback on earlier versions
};