获取本地照片,的尺寸

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NSFileManager * fileManager = [NSFileManagerdefaultManager];

NSString * filePath = [[NSHomeDirectory()stringByAppendingPathComponent:@"/Documents"]stringByAppendingPathComponent:[NSStringstringWithFormat:@"camera%ld.png",currentBtn]];

//path 图片的本地路径

// CGSize size=[UIImage imageWithContentsOfFile:filePath].size;

CGImageRef imageRef = [[UIImage imageWithContentsOfFile:filePath] CGImage];

CGSize size = CGSizeMake(CGImageGetWidth(imageRef), CGImageGetHeight(imageRef));//这个size就是实际图片的像素大小例如系统相册里的花, {1239,822}

//2、获得屏幕分辨率 scale：

CGFloat scale_screen = [UIScreen mainScreen].scale;

//所以要想展示 imageView上面图片的大小

UIImageView * imgView =[[UIImageViewalloc]init] ;

imgView.center = self.view.center;

imgView.bounds = CGRectMake(0, 0, size.width/scale_screen, size.height/scale_screen);

imgView.image = [[UIImage alloc]initWithContentsOfFile:filePath ];

//第二种是苹果官方的

UIImageView * imgView =[[UIImageViewalloc]initWithFrame:CGRectMake(0,0, WIDTH,HEIGHT)] ;

imgView.image = [[UIImagealloc]initWithContentsOfFile:filePath ];

imgView.contentMode =UIViewContentModeScaleAspectFit;// 关于介绍 contentMode : http://blog.csdn.net/annkie/article/details/49247755

[self.view addSubview:imgView];

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