URLから画像をダウンロードしてパソコンに保存するにはどうすればよいですか？

Question

URLからイメージをダウンロードし、Objective-Cを使用してそのイメージをコンピュータに保存する方法を教えてください。これは私がこれまでに得たものである：

NSString *documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; 

UIImage *imageFromURL = [self getImageFromURL:@"https://www.google.com/images/srpr/logo11w.png"]; 

[self saveImage:imageFromURL withFileName:@"Google Logo" ofType:@"png" inDirectory:documentsDirectoryPath]; 

UIImage *imageFromWeb = [self loadImage:@"Google Logo" ofType:@"png" inDirectory:documentsDirectoryPath]; 

は、XcodeはNSImageではと交換しようとすると、UIIMageについて不平を言います。また、宣言されていない識別子 'self'についても不平を言います。

これを実行するには、HTTPコールを行う必要があります。私のように私に説明してください。

Answer 1

ここでは、画像をドキュメントディレクトリに保存するコードを示します。

-(void)saveImagesInLocalDirectory 
{ 
     NSString * documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; 
      NSString *imgName = @"image.png"; 
      NSString *imgURL = @"www.example.com/image/image.png"; 
      NSFileManager *fileManager = [NSFileManager defaultManager]; 
      NSString *writablePath = [documentsDirectoryPath stringByAppendingPathComponent:imgName]; 

      if(![fileManager fileExistsAtPath:writablePath]){ 
       // file doesn't exist 
       NSLog(@"file doesn't exist"); 
       if (imgName) { 
        //save Image From URL 
        [self getImageFromURLAndSaveItToLocalData:imgName fileURL:imgURL inDirectory:documentsDirectoryPath]; 
       } 
      } 
      else{ 
       // file exist 
       NSLog(@"file exist"); 
      } 
} 

-(void) getImageFromURLAndSaveItToLocalData:(NSString *)imageName fileURL:(NSString *)fileURL inDirectory:(NSString *)directoryPath { 
    NSData * data = [NSData dataWithContentsOfURL:[NSURL URLWithString:fileURL]]; 

    NSError *error = nil; 
    [data writeToFile:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@", imageName]] options:NSAtomicWrite error:&error]; 

    if (error) { 
     NSLog(@"Error Writing File : %@",error); 
    }else{ 
     NSLog(@"Image %@ Saved SuccessFully",imageName); 
    } 
} 

そして、これは一つの方法コード..です

-(void)saveImagesInLocalDirectory 
{ 
     NSString * documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; 
      NSString *imgName = @"image.png"; 
      NSString *imgURL = @"www.example.com/image/image.png"; 
      NSFileManager *fileManager = [NSFileManager defaultManager]; 
      NSString *writablePath = [documentsDirectoryPath stringByAppendingPathComponent:imgName]; 

      if(![fileManager fileExistsAtPath:writablePath]){ 
       // file doesn't exist 
       NSLog(@"file doesn't exist"); 
        //save Image From URL 
        NSData * data = [NSData dataWithContentsOfURL:[NSURL URLWithString: imgURL]]; 

        NSError *error = nil; 
        [data writeToFile:[documentsDirectoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@", imgName]] options:NSAtomicWrite error:&error]; 

        if (error) { 
          NSLog(@"Error Writing File : %@",error); 
        }else{ 
          NSLog(@"Image %@ Saved SuccessFully",imgName); 
        } 
      } 
      else{ 
       // file exist 
       NSLog(@"file exist"); 
      } 
} 

Answer 2

これは私のソリューションです！

+(BOOL)downloadMedia :(NSString*)url_ :(NSString*)name{ 
    NSString *stringURL = url_; 
    NSURL *url = [NSURL URLWithString:stringURL]; 
    NSData *urlData = [NSData dataWithContentsOfURL:url]; 
    if (urlData) 
    { 
     NSArray  *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
     NSString *documentsDirectory = [paths objectAtIndex:0]; 

     NSString *filePath = [NSString stringWithFormat:@"%@/%@", documentsDirectory,name]; 
     [urlData writeToFile:filePath atomically:YES]; 
     return YES; 
    } 
    return NO; 
} 

+(UIImage*)loadMedia :(NSString*)name{ 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *getImagePath = [documentsDirectory stringByAppendingPathComponent:name]; 
    UIImage *img_ = [UIImage imageWithContentsOfFile:getImagePath]; 
    return img_; 
}