iphone - 我们如何从本地获取图像？

Question

我通过这段代码将图像存储在本地...

NSData *imageData = UIImagePNGRepresentation(image);
NSString *imageName = [NSString stringWithFormat:@"image.png"];

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *fullPathToFile = [documentsDirectory stringByAppendingPathComponent:imageName];

[imageData writeToFile:fullPathToFile atomically:YES];

我可以在我的 iphone 模拟器包中看到这张图片......但是我怎样才能取回这张图片？

Answer 1

如果您的意思是从文件重新创建图像，您可以使用 UIImage 的 +imageWithContentsOfFile: 非常简单地做到这一点。方法:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *fullPathToFile = [documentsDirectory stringByAppendingPathComponent:@"someImageName"];
UIImage *image = [UIImage imageWithContentsOfFile:fullPathToFile];