####iOS7 Programming Cookbook 第一章学习笔记 UINavigationController
#####Displaying an Image on a Navigation Bar
#####ViewController.m1
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18- (void)viewDidLoad{
[super viewDidLoad];
//创建imageView
UIImageView *imageView =[[UIImageView alloc]initWithFrame:CGRectMake(0.0f, 0.0f, 100.0f, 40.0f)];
//通过保持长宽比的大小选择规模内容视图，任何剩余的视图区域的边界是透明的。
imageView.contentMode = UIViewContentModeScaleAspectFit;
/*读取一个图片. Be careful, this image will be cached */
UIImage *image = [UIImage imageNamed:@"Logo"];
//设置imageView的图片为image
[imageView setImage:image];
//设置titleView
self.navigationItem.titleView = imageView;
}
