Where to use ： 

[_addButton setBackgroundImage:[UIImage imageWithColor:[[UIColor whiteColor] colorWithAlphaComponent:0.f]] forState:UIControlStateDisabled];

UIImage+Theme.m

==============================

+ (UIImage *)imageWithColor:(UIColor *)color

{

CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);

UIGraphicsBeginImageContext(rect.size);

CGContextRef context = UIGraphicsGetCurrentContext();

CGContextSetFillColorWithColor(context, [color CGColor]);

CGContextFillRect(context, rect);
UIImage *bg = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return bg;

}

Where to use ：

[UIImage imageWithColor:[[UIColor whiteColor] colorWithAlphaComponent:0.f]]

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