为什么清除按钮不与 UITextField 中的文本对齐？
我在 UITableViewCell 中有一个 UITextField。 由于某种原因，清除按钮未与文本字段的文本对齐。 这是我的文本字段代码：
cell.selectionStyle = UITableViewCellSelectionStyleNone;
usernameField = [[UITextField alloc] initWithFrame:CGRectMake(22, 10, cell.contentView.frame.size.width, cell.contentView.frame.size.height)];
usernameField.adjustsFontSizeToFitWidth = YES;
usernameField.placeholder = @"Username";
usernameField.backgroundColor = [UIColor clearColor];
usernameField.keyboardType = UIKeyboardTypeDefault;
usernameField.autocapitalizationType = UITextAutocorrectionTypeNo;
usernameField.autocorrectionType = UITextAutocorrectionTypeNo;
usernameField.returnKeyType = UIReturnKeyNext;
usernameField.delegate = self;
usernameField.clearButtonMode = UITextFieldViewModeAlways;
[usernameField setEnabled:YES];
[cell addSubview:usernameField];
[usernameField becomeFirstResponder];
[usernameField release];
这是演示问题的图片： 
编辑： 我也尝试过 - (CGRect)clearButtonRectForBounds:(CGRect)bounds 但仍然没有任何结果
I have an UITextField in an UITableViewCell.
For some reason the clear button isn't align to the textField's text.
Here's my textField code:
cell.selectionStyle = UITableViewCellSelectionStyleNone;
usernameField = [[UITextField alloc] initWithFrame:CGRectMake(22, 10, cell.contentView.frame.size.width, cell.contentView.frame.size.height)];
usernameField.adjustsFontSizeToFitWidth = YES;
usernameField.placeholder = @"Username";
usernameField.backgroundColor = [UIColor clearColor];
usernameField.keyboardType = UIKeyboardTypeDefault;
usernameField.autocapitalizationType = UITextAutocorrectionTypeNo;
usernameField.autocorrectionType = UITextAutocorrectionTypeNo;
usernameField.returnKeyType = UIReturnKeyNext;
usernameField.delegate = self;
usernameField.clearButtonMode = UITextFieldViewModeAlways;
[usernameField setEnabled:YES];
[cell addSubview:usernameField];
[usernameField becomeFirstResponder];
[usernameField release];
And here's the picture to demonstrate the problem:
Edit:
I also tried with - (CGRect)clearButtonRectForBounds:(CGRect)bounds and still nothing
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您的 contentVerticalAlignment 属性是什么？当清除按钮居中对齐但文本顶部对齐时，我发现此问题出现。尝试将文本字段对齐方式设置为以下内容：
运气好吗？
What is your contentVerticalAlignment property? I've seen this issue show up when the clear button is center aligned but the text is aligned the top. Try setting your textfield alignment to the following:
Any luck with that?