iOS-以jpg格式保存图像

Question

我的问题是保存图像的格式是dat还是jpg。 这是我使用的代码：

    NSString * urlImage = .....;
    NSString * _folderPath = .....;

    NSString * imageName = [[urlImage componentsSeparatedByString:@"/"] lastObject];
        NSString * jpegPath = [NSString stringWithFormat:@"%@%@",_folderPath,imageName];

        if (![[NSFileManager defaultManager] fileExistsAtPath:jpegPath])
        {
            NSURL *url = [NSURL URLWithString:urlImage];
            //Download image
            UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:url]];

            //Save image
            NSData *data = [NSData dataWithData:UIImageJPEGRepresentation(image, 1.0f)];//1.0f = 100% quality
            [data writeToFile:jpegPath atomically:YES];
        }

Answer 1

以下是保存.jpg图像的代码段

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *docs = [paths objectAtIndex:0];
NSString* path =  [docs stringByAppendingFormat:@"/image1.jpg"];

NSData* imageData = [NSData dataWithData:UIImageJPEGRepresentation(imageView.image, 80)];
NSError *writeError = nil;
[imageData writeToFile:path options:NSDataWritingAtomic error:&writeError];

Answer 2

你应该用

用于创建或获取确切有效路径的stringByAppendingPathComponent方法

使用这种方式：

    NSString * jpegPath = [_folderPath stringByAppendingPathComponent:imageName];// [NSString stringWithFormat:@"%@%@",_folderPath,imageName];