以下是如何为图像设置背景:
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"Background.png"]];
Edit:写下Felixyz所说的话(感谢Manni)，请在学员中这样做:
window.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"Background.png"]];
And in each view you want to have the image, do this:
self.view.backgroundColor = [UIColor clearColor];