How to fill the background with image in landscape in IOS? 如何使image水平铺满屏幕
UIImageView *backgroundImage = [[UIImageView alloc] initWithFrame:self.view.frame];
[backgroundImage setImage:[UIImage imageNamed:@"spriteBG.png"]];
[backgroundImage setContentMode:UIViewContentModeTopLeft];
[self.view addSubview:backgroundImage];
[self.view sendSubviewToBack:backgroundImage];