如何在手机文档中的子文件夹（AnyName）中保存图像帮助我

Question

她在我的程序中使用这个编码

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *docsPath = [paths objectAtIndex:0]; 
NSString *imageCacheDirPath = [docsPath stringByAppendingPathComponent:@"Image"];
NSString *imageCachePath = [imageCacheDirPath stringByAppendingPathComponent:@"1.jpg"]; 
[[NSFileManager defaultManager] createFileAtPath:imageCachePath contents:dataObj attributes:nil];

我的编码中出了什么问题。发现一些示例代码。

Answer 1

一个潜在的问题是，当您尝试在其中创建文件时，“Image”目录不存在 - createFileAtPath方法需要正确运行。因此，请检查Image文件夹是否存在，并根据需要创建它：

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *docsPath = [paths objectAtIndex:0]; 
NSString *imageCacheDirPath = [docsPath stringByAppendingPathComponent:@"Image"];
NSString *imageCachePath = [imageCacheDirPath stringByAppendingPathComponent:@"1.jpg"]; 

if (![[NSFileManager defaultManager] fileExistsAtPath: imageCacheDirPath])
      [[NSFileManager defaultManager] createDirectoryAtPath:imageCacheDirPath 
                                withIntermediateDirectories:NO 
                                                 attributes:nil
                                                      error:NULL];

[[NSFileManager defaultManager] createFileAtPath:imageCachePath 
                                        contents:dataObj 
                                      attributes:nil];