如何在UITextField的左侧显示清除按钮？

Question

我正在开发一个阿拉伯语的应用程序，我有UITextField和textAlignment权限。现在我想在左侧显示textField的清除按钮。是否可以在不添加自定义按钮的情况下执行此操作？

当前位置

期望的位置

Answer 1

使用以下类别并确保您的文字对齐方式正确：）

@interface UICrossButtonTextField:UITextField
- (CGRect)clearButtonRectForBounds:(CGRect)bounds;
@end

@implementation UICrossButtonTextField
- (CGRect)clearButtonRectForBounds:(CGRect)bounds {
    CGRect originalRect = [super clearButtonRectForBounds:bounds];
    return CGRectOffset(originalRect, -originalRect.origin.x+5, 0); }


- (CGRect)editingRectForBounds:(CGRect)bounds {
    CGRect originalRect = [super clearButtonRectForBounds:bounds];
    bounds = CGRectMake(originalRect.size.width, bounds.origin.y, bounds.size.width-originalRect.size.width, bounds.size.height);
    return CGRectInset(bounds, 13, 3);
}

@end

Answer 2

虽然我建议您检查this answer处理从左到右的应用语言，但作为一种解决方法，您可以关注userar's answer，以下代码段是 Swift 3 他的回答版本：

创建自定义UITextField类，如下所示：

class CustomTextField: UITextField {
    private var originalRect = CGRect.zero

    override func awakeFromNib() {
        super.awakeFromNib()

        originalRect = super.clearButtonRect(forBounds: bounds)
        clearButtonMode = .whileEditing
        textAlignment = .right
    }

    override func clearButtonRect(forBounds bounds: CGRect) -> CGRect {
        return originalRect.offsetBy(dx: -originalRect.origin.x + 5, dy: 0)
    }

    override func editingRect(forBounds bounds: CGRect) -> CGRect {
        let bounds = CGRect(x: originalRect.size.width, y: bounds.origin.y, width: bounds.size.width-originalRect.size.width, height: bounds.size.height)
        return bounds.insetBy(dx: 13, dy: 3)
    }
}

输出结果为：

Answer 3

SWIFT 3语法：

 class TextFields: UITextField {

  // You will need this
private var firstPlace = CGRect.zero

override func awakeFromNib() {
    super.awakeFromNib()

    firstPlace = super.clearButtonRect(forBounds: bounds) // to access clear button properties

/* uncomment these following lines if you want but you can change them in main.storyboard too 

    clearButtonMode = .whileEditing // to show the clear button only when typing starts

    textAlignment = .right // to put the text to right side
*/
}
   // Function to change the clear button
override func clearButtonRect(forBounds bounds: CGRect) -> CGRect {

    return firstPlace.offsetBy(dx: -firstPlace.origin.x + 5, dy: 0)
}

}

希望它有效