屏幕截图仅部分屏幕 - Swift

Question

我正在使用此 Swift 代码截取我的应用程序的屏幕截图：

UIGraphicsBeginImageContextWithOptions(UIScreen.mainScreen().bounds.size, false, 0);
self.view.drawViewHierarchyInRect(view.bounds, afterScreenUpdates: true)
var image:UIImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

我如何只截取屏幕的一部分，而不是全部，就像我在这里所做的那样？

Answer 1

例如，如果您想在位置 (50,50) 处截取 UIView 矩形的屏幕截图，高度为 (100,150)。

首先将图像上下文设置为矩形的大小。这将设置图像大小。

UIGraphicsBeginImageContextWithOptions(CGSizeMake(100,150), false, 0);

现在在此上下文中绘制视图，使屏幕截图的 可见部分 从 (50,50)

开始

self.view.drawViewHierarchyInRect(CGRectMake(-50,-50,view.bounds.size.width,view.bounds.size.height) afterScreenUpdates: true)

这会截取 (100,150) 处的屏幕截图，因为我们设置了 context 的大小。现在从中获取 UIImage。

var image:UIImage = UIGraphicsGetImageFromCurrentImageContext();

Answer 2

我认为这是拍摄部分屏幕的最佳答案：

func screenShot() {
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(self.frame.size.width*0.99,self.frame.size.height*0.70), false, 0)
    var image:UIImage = UIGraphicsGetImageFromCurrentImageContext();
    self.view?.drawViewHierarchyInRect(CGRectMake(-01, -01, self.frame.size.width, self.frame.size.height), afterScreenUpdates: true)
    var screenShot  = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
}

Answer 3

用于按另一个 UIView 的区域选择快照

// viewObject: UIView linked from storyboard
var bounds= CGRect(x: -viewObject.frame.minX,y: -viewObject.frame.minY,width: view.bounds.size.width,height: view.bounds.size.height)

UIGraphicsBeginImageContext(viewObject.frame.size)
        view.drawHierarchy(in: bounds, afterScreenUpdates: true)
        let outputImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()

Answer 4

func captureView(view: UIView) -> UIImage {
    var screenRect: CGRect = view.bounds
    UIGraphicsBeginImageContext(screenRect.size)
    UIGraphicsBeginImageContextWithOptions(screenRect.size, true, 0)
    var ctx: CGContext = UIGraphicsGetCurrentContext()!
    UIColor.black.set()
    ctx.fill(screenRect)
    view.layer.render(in: ctx)
    var newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
    UIGraphicsEndImageContext()
    return newImage
}

屏幕截图仅部分屏幕 - Swift

Screenshot Only Part of Screen - Swift

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