从网络下载图片，保存，并用 UIImageView 从保存中显代码,ObjC代码库,德仔网

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【ObjC】从网络下载图片，保存，并用 UIImageView 从保存中显

作者:宝清 / 发布于2014/11/17/ 394


	//从网络下载图片
	-(UIImage *) getImageFromURL:(NSString *)fileURL {
	 NSLog(@"执行图片下载函数");
	 UIImage * result;
	
	 NSData * data = [NSData dataWithContentsOfURL:[NSURL URLWithString:fileURL]];
	 result = [UIImage imageWithData:data];
	
	 return result;
	}
	
	//将所下载的图片保存到本地
	-(void) saveImage:(UIImage *)image withFileName:(NSString *)imageName ofType:(NSString *)extension inDirectory:(NSString *)directoryPath {
	 if ([[extension lowercaseString] isEqualToString:@"png"]) {
	 [UIImagePNGRepresentation(image) writeToFile:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.%@", imageName, @"png"]] options:NSAtomicWrite error:nil];
	 } else if ([[extension lowercaseString] isEqualToString:@"jpg"] || [[extension lowercaseString] isEqualToString:@"jpeg"]) {
	 [UIImageJPEGRepresentation(image, 1.0) writeToFile:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.%@", imageName, @"jpg"]] options:NSAtomicWrite error:nil];
	 } else {
	 //ALog(@"Image Save Failed\nExtension: (%@) is not recognized, use (PNG/JPG)", extension);
	 NSLog(@"文件后缀不认识");
	 }
	}
	
	//读取本地保存的图片
	-(UIImage *) loadImage:(NSString *)fileName ofType:(NSString *)extension inDirectory:(NSString *)directoryPath {
	 UIImage * result = [UIImage imageWithContentsOfFile:[NSString stringWithFormat:@"%@/%@.%@", directoryPath, fileName, extension]];
	
	 return result;
	}
	
	//从网络下载图片，保存，并用 UIImageView 从保存中显示
	NSString * documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
	 NSLog(@"保存路径:%@",documentsDirectoryPath);
	 //Get Image From URL
	 UIImage * imageFromURL = [self getImageFromURL:@"http://file.duteba.com/phone/2009/04/5/ftGxL8kcUL.jpg"];
	
	 //Save Image to Directory
	 [self saveImage:imageFromURL withFileName:@"MyImage" ofType:@"jpg" inDirectory:documentsDirectoryPath];
	
	 //Load Image From Directory
	 UIImage * imageFromWeb = [self loadImage:@"MyImage" ofType:@"jpg" inDirectory:documentsDirectoryPath];
	 [img setImage:imageFromWeb];
	
	 //取得目录下所有文件名
	 NSArray *file = [[[NSFileManager alloc] init] subpathsAtPath:documentsDirectoryPath];
	 //NSLog(@"%d",[file count]);
	 NSLog(@"%@",file);

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　网络下载　　 UIImageView　

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