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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | //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); |