修改UITextField右侧clearButton的图片
// 获取密码field的X按钮
UIButton *passwordBtn = [_passwordField valueForKey:@"_clearButton"];
// 修改按钮图片
[passwordBtn setImage:[UIImage imageNamed:@"login_checkbox_checked"]forState:UIControlStateNormal];
// 获取密码field的X按钮
UIButton *passwordBtn = [_passwordField valueForKey:@"_clearButton"];
// 修改按钮图片
[passwordBtn setImage:[UIImage imageNamed:@"login_checkbox_checked"]forState:UIControlStateNormal];