iosUITextField属性

@PRoperty UITextField *caption;

caption= [[UITextField alloc] initWithFrame:CGRectMake(0,

self.frame.size.height/2,

self.frame.size.width,32)];

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=0;

caption.tintColor=[UIColor whiteColor];

caption.delegate= self;