swift - 如何在 Swift 中设置 UIWindow 属性

Question

我一直在尝试对 Swift 中的 UIWindow 边界进行简单的更改。到目前为止，我有:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions:NSDictionary?) -> Bool {
    // Override point for customization after application launch.


    //SHIFT EVERYTHING DOWN - THEN UP IN INDIV VCs IF ios7>
    var device:UIDevice=UIDevice()
    var systemVersion:String=device.systemVersion
    println(systemVersion)
    //Float(systemVersion)

    if (systemVersion >= "7.0") {
        UIApplication.sharedApplication().setStatusBarStyle(UIStatusBarStyle.LightContent, animated: true)
        self.window.setClipsToBounds = true // --> Member doesnt exist in UIWindow
        self.window.frame = CGRectMake(0,20,self.window.frame.size.width,self.window.frame.size.height);
        self.window.bounds = CGRectMake(0,0, self.window.frame.size.width, self.window.frame.size.height);
    //}

    let ok = true
    println("Hello World")
    return true
}

但我得到:

UIWindow 没有在每个 self.window.property setter 行命名的成员。

Answer 1

问题是 self.window 是可选的。你首先要"unwrap" it .您还需要使用 clipsToBounds 而不是 setClipsToBounds。

if let window = self.window {
    window.clipsToBounds = true
    window.frame = CGRect(x: 0, y: 20, width: window.frame.size.width, height: window.frame.size.height);
    window.bounds = CGRect(x: 0, y: 0, width: window.frame.size.width, height: window.frame.size.height);
}

注意:我还将 CGRectMake 更新为使用 CGRect 初始值设定项而不是全局 CGRectMake 函数创建 CGRect 的首选 Swift 方式。