ios - iOS7 上的 UITextfield leftView/rightView 填充

Question

iOS7 上 UITextField 的 leftView 和 rightView View 非常接近文本框的边框。

如何为这些项目添加一些(水平)填充？

我尝试修改框架，但没有成功

uint padding = 10;//padding for iOS7
UIImageView * iconImageView = [[UIImageView alloc] initWithImage:iconImage];    
iconImageView.frame = CGRectMake(0 + padding, 0, 16, 16);
textField.leftView = iconImageView;

请注意，我对向文本字段的文本添加填充不感兴趣，例如 Set padding for UITextField with UITextBorderStyleNone

Answer 1

一个更简单的解决方案，它利用了 contentMode:

    arrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"down_arrow"]];
    arrow.frame = CGRectMake(0.0, 0.0, arrow.image.size.width+10.0, arrow.image.size.height);
    arrow.contentMode = UIViewContentModeCenter;

    textField.rightView = arrow;
    textField.rightViewMode = UITextFieldViewModeAlways;

在 Swift 3 中，

    let arrow = UIImageView(image: UIImage(named: "arrowDrop"))
    if let size = arrow.image?.size {
        arrow.frame = CGRect(x: 0.0, y: 0.0, width: size.width + 10.0, height: size.height)
    }
    arrow.contentMode = UIViewContentMode.center
    self.textField.rightView = arrow
    self.textField.rightViewMode = UITextFieldViewMode.always