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//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:@"%@.%@",@"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); //该片段来自于http://outofmemory.cn
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