设置UIView的图片

//自定义的UIView

BackView *backView=[[BackView alloc]initWithFrame:CGRectMake(SCREEN_HEIGHT-130, 50, 91, 34)];

//把图片转为颜色

UIColor *bgColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"back.png"]];

//把颜色设置为uiview的背景色

 [backView setBackgroundColor:bgColor];