iOS 沙盒图片保存读取

//保存图片

-(void)saveImageDocuments:(UIImage *)image{

//拿到图片

UIImage *imagesave = image;

NSString *path_sandox = NSHomeDirectory();

//设置一个图片的存储路径

NSString *imagePath = [path_sandox stringByAppendingString:@"/Documents/test.png"];

//把图片直接保存到指定的路径（同时应该把图片的路径imagePath存起来，下次就可以直接用来取）

[UIImagePNGRepresentation(imagesave) writeToFile:imagePath atomically:YES];

}

// 读取并存贮到相册

-(UIImage *)getDocumentImage{

// 读取沙盒路径图片

NSString *aPath3=[NSString stringWithFormat:@"%@/Documents/%@.png",NSHomeDirectory(),@"test"];

// 拿到沙盒路径图片

UIImage *imgFromUrl3=[[UIImage alloc]initWithContentsOfFile:aPath3];

// 图片保存相册

UIImageWriteToSavedPhotosAlbum(imgFromUrl3, self, nil, nil);

return imgFromUrl3;

}