iosUITextField属性

@property UITextField *caption;

caption = [[UITextField alloc] initWithFrame:CGRectMake(,

                                                            self.frame.size.height/,

                                                            self.frame.size.width,

                                                            )];

    caption.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5];

    caption.textAlignment = NSTextAlignmentCenter;

    caption.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

    caption.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;

    caption.textColor = [UIColor whiteColor];

    caption.keyboardAppearance = UIKeyboardAppearanceDark;

    caption.alpha = ;

    caption.tintColor = [UIColor whiteColor];

    caption.delegate = self;