在iOS中下载和保存图像

Question

我正在创建一个iPhone应用程序,我想从Web服务下载多个图像文件.我想将图像保存在应用程序本身的本地文件夹中,并保存SQLite数据库中每个文件的路径.我该如何实现呢？请帮忙.

Answer 1

**// Get an image from the URL below**
    UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"yorimageurl"]]];

    NSLog(@"%f,%f",image.size.width,image.size.height);

    **// Let's save the file into Document folder.**

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

    NSString *pngPath = [NSString stringWithFormat:@"%@/test.png",Dir];// this path if you want save reference path in sqlite 
    NSData *data1 = [NSData dataWithData:UIImagePNGRepresentation(image)];
    [data1 writeToFile:pngFilePath atomically:YES];

    NSLog(@"saving jpeg");
    NSString *jpegPath = [NSString stringWithFormat:@"%@/test.jpeg",Dir];// this path if you want save reference path in sqlite 
    NSData *data2 = [NSData dataWithData:UIImageJPEGRepresentation(image, 1.0f)];//1.0f = 100% quality
    [data2 writeToFile:jpegFilePath atomically:YES];

    NSLog(@"saving image done");

    [image release];

>>更新附加:

您需要在sqlite数据库中保存图像名称(您可以提前做的唯一名称......正确!!),您可以使用该名称创建路径或检索图像,如下所示.

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,     NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *getImagePath = [documentsDirectory stringByAppendingPathComponent:@"test.png"];// here you jus need to pass image name that you entered when you stored it.

希望对你有帮助...