iOS UIUIButton设置动态图片

self.bottomButton = [UIButton buttonWithType:UIButtonTypeCustom];

self.bottomButton.frame = CGRectMake(10, [UIScreen mainScreen].bounds.size.height-70, 50, 50);

UIImage *image = [UIImage animatedImageNamed:@"aa" duration:3];

[self.bottomButton setImage:image forState:UIControlStateNormal];

[self.view addSubview:self.bottomButton];

var image = UIImage.animatedImageNamed("aa", duration: 3.0)  

let btn1 = UIButton.buttonWithType(UIButtonType.System) as! UIButton  

btn1.frame = CGRectMake(20, 50, 320, 36);  

btn1.setImage(image, forState: UIControlState.Normal)  

self.view.addSubview(btn1);