为什么 NSFileManager 找不到这些 png 文件？

Question

在研究了此处 (a, b, , d, e, f & g) 问题的答案后，我编写了打开图像文件的代码。但是即使我将 png 文件添加到项目中，NSFileManager 也无法找到它们。我有理由相信我的代码应该能够识别任何一个 png 文件，如果它们位于正确的目录中的话。

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];

}

但是这里是调试日志window

    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。那么在哪里可以找到它们呢？即我需要对我的代码进行哪些更改才能找到它们？

编辑

本草稿根据 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];
}

日志现在显示为

     Found file path :  … .app/iTunesArtwork1024.png

并且图像也出现在 subview.

__

Answer 1

图片不在Document Directory,在bundle.

里面

您已经在项目中添加了图像文件。但是您正在检查 Document 目录中的图像，这是错误的。图片在 app bundle.

内

您可以简单地通过图像的name将Image分配给UIImageView。

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

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

如果要获取图片的路径，那就得用[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。试试下面的代码

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

Answer 3

您要查找图像的路径在您的设备（真实设备或模拟器）中。

要加载存储在您的 XCode 项目中的图像，只需执行以下操作：

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

为什么 NSFileManager 找不到这些 png 文件？

Why is NSFileManager unable to find these png files?

ios

objective-c

uiimageview

nsfilemanager