Question

在研究了此处的问题答案后，我编写了打开图像文件的代码（a，b，c，d，e， f＆amp; g）。但是，即使我将png文件添加到项目中，NSFileManager仍无法找到它们。我有理由相信，如果png文件位于正确的目录中，我的代码应该能够识别它们。

e.g.

- (void)viewDidLoad {
    [super viewDidLoad];

    NSFileManager *fileManager = [[NSFileManager alloc] init];

    NSArray  *dirPaths;
    NSString *docsDir;

    dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    docsDir = [dirPaths objectAtIndex:0];

    NSLog(@"\ndirPaths %@ \n\ndocsDir \n%@", dirPaths, docsDir);

    NSString *imageFilePath = [docsDir stringByAppendingPathComponent:@"iTunesArtwork1024.png"];

    NSLog(@"\n\nfile path should be \n\n%@ \n\n", imageFilePath);

    NSData *imageData = [NSData dataWithContentsOfFile:imageFilePath];

    if ([fileManager fileExistsAtPath:imageFilePath])

    {
        NSLog(@"\nFound file path : %@", imageFilePath);
    }

    else

    {
        NSLog(@"\nImage file not found");
    }

    UIImage  *image = [UIImage imageWithData:imageData];

    UIImageView *logo = [[UIImageView alloc] init];
    logo.image = image;
    [self.view addSubview:logo];

}

但这是调试窗口中的日志

    2017-07-14 18:26:35.679 IconShape[1089:348564] 
    dirPaths (
    "/Users/gs/Library/Developer/CoreSimulator/Devices/57279C80-0937-4658-B0E6-7984B3768D56/data/Containers/Data/Application/18235DBF-7ADB-47D4-AFF9-282D02F2A0F8/Documents"
    ) 

    docsDir 
    /Users/gs/Library/Developer/CoreSimulator/Devices/57279C80-0937-4658-B0E6-7984B3768D56/data/Containers/Data/Application/18235DBF-7ADB-47D4-AFF9-282D02F2A0F8/Documents
    2017-07-14 18:26:35.679 IconShape[1089:348564] 

    file path should be 

    /Users/gs/Library/Developer/CoreSimulator/Devices/57279C80-0937-4658-B0E6-7984B3768D56/data/Containers/Data/Application/18235DBF-7ADB-47D4-AFF9-282D02F2A0F8/Documents/iTunesArtwork1024.png 

    2017-07-14 18:26:35.679 IconShape[1089:348564] 
    Image file not found

这是添加两个png文件后项目的状态。然而，日志显示它们对NSFileManager不可见。那他们会在哪里找到？即我需要对代码进行哪些更改才能找到它们？

修改

该草案根据Subramanian的推荐找到了png文件。

    - (void)viewDidLoad {
    [super viewDidLoad];

    NSFileManager *fileManager  = [[NSFileManager alloc] init];

    NSString *imageFilePath     = [[NSBundle mainBundle]pathForResource:@"iTunesArtwork1024" ofType:@"png"];

    if ([fileManager fileExistsAtPath:imageFilePath])

    {
        NSLog(@"\nFound file path : %@", imageFilePath);
    }

    else

    {
        NSLog(@"\nImage file not found");
    }

    UIImage  *image     = [UIImage imageNamed:@"iTunesArtwork1024.png"];
    UIImageView *logo   = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 50, 50)];
    logo.image          = image;
    [self.view addSubview:logo];
}

现在的日志为

     Found file path :  … .app/iTunesArtwork1024.png

，图片也会显示在subview.

中

__

Answer 1

图片不在Document Directory内，位于bundle内。

您已在项目中添加了图像文件。但是您正在检查Document目录上的图像，这是错误的。图片位于app bundle内。

您只需将Image分配给图片的UIImageView name即可。

UIImage  *image = [UIImage imageNamed:@"iTunesArtwork1024.png"];

UIImageView *logo = [[UIImageView alloc] init];
logo.image = image;

如果您想获取图片的路径，则必须使用[NSBundle mainBundle]

[[NSBundle mainBundle]pathForResource:@"iTunesArtwork1024" ofType:@"png"];

Answer 2

您可以访问在项目中添加名称的图像。尝试使用以下代码

// Call inside View controller C    
        self.presentingViewController?.dismissViewControllerAnimated(false, completion: nil)
        self.presentingViewController?.dismissViewControllerAnimated(true, completion: nil)

Answer 3

您正在寻找图像的路径位于您的设备内（真实或模拟器）。

要加载存储在XCode项目中的图像，请执行以下操作：

UIImage* image = [UIImage imageNamed:@"iTunesArtwork1024.png"];

为什么NSFileManager无法找到这些png文件？

3 个答案: