与self.view相关的游标位置

Question

在UITextView中获取游标CGPoint有很多答案。但我需要找到与self.view（或手机屏幕边框）相关的光标位置。在Objective-C中有这样做的方法吗？

Answer 1

UIView有一个convert(_:to:)方法，确实如此。它将坐标从接收器坐标空间转换到另一个视图坐标空间。

下面是一个例子：

目标C

UITextView *textView = [[UITextView alloc] initWithFrame:CGRectZero]; 
UITextRange *selectedTextRange = textView.selectedTextRange; 
if (selectedTextRange != nil) 
{ 
    // `caretRect` is in the `textView` coordinate space. 
    CGRect caretRect = [textView caretRectForPosition:selectedTextRange.end]; 

    // Convert `caretRect` in the main window coordinate space. 
    // Passing `nil` for the view converts to window base coordinates. 
    // Passing any `UIView` object converts to that view coordinate space. 
    CGRect windowRect = [textView convertRect:caretRect toView:nil]; 
} 
else { 
    // No selection and no caret in UITextView. 
} 

夫特

let textView = UITextView() 
if let selectedRange = textView.selectedTextRange 
{ 
    // `caretRect` is in the `textView` coordinate space. 
    let caretRect = textView.caretRect(for: selectedRange.end) 

    // Convert `caretRect` in the main window coordinate space. 
    // Passing `nil` for the view converts to window base coordinates. 
    // Passing any `UIView` object converts to that view coordinate space. 
    let windowRect = textView.convert(caretRect, to: nil) 
} 
else { 
    // No selection and no caret in UITextView. 
}