IOS之文件夹创建、删除，图片在本地的保存和加载

本文转自http://blog.csdn.net/toddmi/article/details/8204102

 = (NSCachesDirectory, NSUserDomainMask, YES);
 = [cachePaths objectAtIndex:0];
 }

 = (NSCachesDirectory, NSUserDomainMask, YES);
 = [cachePaths objectAtIndex:0];
 }

 = (dirName);
 = ;
 = [NSFileManager defaultManager];
 = [fileManager fileExistsAtPath:imageDir isDirectory:&isDir];
 = ;
 == YES &&  == YES) )
 = [fileManager createDirectoryAtPath:imageDir withIntermediateDirectories:YES attributes:nil error:nil];
 = (dirName);
 = ;
 = [NSFileManager defaultManager];
 = [fileManager fileExistsAtPath:imageDir isDirectory:&isDir];
 = ;
 == YES &&  == YES )
 = [fileManager removeItemAtPath:imageDir error:nil];
 = ;
 = [NSFileManager defaultManager];
 = [fileManager fileExistsAtPath:directoryPath isDirectory:&isDir];
 = ;
 == YES &&  == YES )

 = [UIImagePNGRepresentation(image) writeToFile:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.%@", imageName, @"png"]] options:NSAtomicWrite error:nil];

 = [UIImageJPEGRepresentation(image, 1.0) writeToFile:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.%@", imageName, @"jpg"]] options:NSAtomicWrite error:nil];

 = ;
 = [NSFileManager defaultManager];
 = [fileManager fileExistsAtPath:directoryPath isDirectory:&isDir];
 == YES &&  == YES )
 = [directoryPath stringByAppendingString : imageName];
 = [fileManager fileExistsAtPath:imagePath];
 = [NSData dataWithContentsOfFile : imagePath];

 = (dirName);
 = ;
 = [NSFileManager defaultManager];
 = [fileManager fileExistsAtPath:imageDir isDirectory:&isDir];
 = ;
 == YES &&  == YES) )
 = [fileManager createDirectoryAtPath:imageDir withIntermediateDirectories:YES attributes:nil error:nil];
 = (dirName);
 = ;
 = [NSFileManager defaultManager];
 = [fileManager fileExistsAtPath:imageDir isDirectory:&isDir];
 = ;
 == YES &&  == YES )
 = [fileManager removeItemAtPath:imageDir error:nil];
 = ;
 = [NSFileManager defaultManager];
 = [fileManager fileExistsAtPath:directoryPath isDirectory:&isDir];
 = ;
 == YES &&  == YES )

 = [UIImagePNGRepresentation(image) writeToFile:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.%@", imageName, @"png"]] options:NSAtomicWrite error:nil];

 = [UIImageJPEGRepresentation(image, 1.0) writeToFile:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.%@", imageName, @"jpg"]] options:NSAtomicWrite error:nil];

 = ;
 = [NSFileManager defaultManager];
 = [fileManager fileExistsAtPath:directoryPath isDirectory:&isDir];
 == YES &&  == YES )
 = [directoryPath stringByAppendingString : imageName];
 = [fileManager fileExistsAtPath:imagePath];
 = [NSData dataWithContentsOfFile : imagePath];