Cocoa touch UITextField赢得'；不显示清除按钮

我有一个UITextField，我想在其中显示一个clear按钮。UITextField的cornerRadius已修改，并且没有边框。我还在文本区域的左侧和右侧添加了填充。下面的代码没有清除按钮

searchField.layer.cornerRadius = 15;
searchField.clearButtonMode = UITextFieldViewModeAlways;
UIView *padding = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 8, 20)];
searchField.leftView = padding;
searchField.leftViewMode = UITextFieldViewModeAlways;
searchField.rightView = padding;
searchField.rightViewMode = UITextFieldViewModeAlways;
[padding release];
[searchField addTarget:self action:@selector(textFieldDidChange) forControlEvents:UIControlEventEditingChanged];
searchField.userInteractionEnabled = YES;

有人知道我为什么不能让按钮显示吗？ 我非常感谢你的帮助

谢谢

也许你可以试试这个

[textFieldAddress_ setLeftView:buttonBookmark_];
[textFieldAddress_ setLeftViewMode: UITextFieldViewModeAlways];
[textFieldAddress_ setRightView:buttonReloadAndCancel_];
[textFieldAddress_ setRightViewMode: UITextFieldViewModeUnlessEditing];
textFieldAddress_.clearButtonMode = UITextFieldViewModeWhileEditing;

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我认为只要付出就可以了

textField.clearButtonMode = UITextFieldViewModeWhileEditing;

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在编辑和设置任何角半径时，您都可以清除按钮。

这太棒了。谢谢这对我很管用。苹果的文档难道不应该指出拥有一个rightView将覆盖clear按钮吗？