textField 光标缩进自定义

UILabel *leftView = [[UILabel alloc] initWithFrame:CGRectMake(0.f, 0.f, 15 / WIDTH_6S_SCALE, 0.f)];

searchLeftView.backgroundColor = [UIColor clearColor];

textField.leftView = searchLeftView;

textField.leftViewMode = UITextFieldViewModeAlways;

textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;