获取 UIImage 以在 UIImageView 中显示 [英] Get UIImage to show in UIImageView

问题描述

我的视图没有显示.

我创建了一个空应用程序并添加了一个按钮和一个 UIImageView.

I created an empty application and added a button and an UIImageView.

我使用了故事板.只有一个故事板.一个箭头指向这个故事板.

I used storyboards. There is only one storyboard. An arrow points to this storyboard.

我在 AppDelegate 中设置了 rootViewController.我在视图控制器中设置了下面的图像.

I set the rootViewController in the AppDelegate. I set the image below in the view controller.

图像在 Images.xcassets 蓝色文件夹中列为bl_5_00".

The image is listed as 'bl_5_00' in the Images.xcassets blue folder.

一个红色按钮也没有显示，这让我相信我把其他更结构化的东西搞砸了.

A red button doesn't show either which leads me to believe I have messed something else up that is more structural.

应用委托

#import "PEPI_AppDelegate.h"
#import "PEPI_LessonViewController.h"

@implementation PEPI_AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];

    PEPI_LessonViewController *controller = [[PEPI_LessonViewController alloc] init];
    self.window.rootViewController = controller;

    [self.window makeKeyAndVisible];
    return YES;
}

视图控制器

#import "PEPI_LessonViewController.h"

@interface PEPI_LessonViewController ()

@property (weak, nonatomic) IBOutlet UIImageView *mainImage;

@end

@implementation PEPI_LessonViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    UIImage *imageYouWantToPass = [UIImage imageNamed:@"bl_5_00"];

    self.mainImage.image = imageYouWantToPass;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

推荐答案

如果使用

[UIImage imageWithContentsOfFile:@"bl_5_00"];

这意味着您正在尝试从绝对文件路径中获取图像，而在这里您传递的是相对名称，但这是行不通的.你可以试试.

that means you are trying to fetch the image from an absolute file path, and here you are passing relative name which will not work. You can try instead..

NSString *filePath=[[NSBundle mailBundle] pathForResource:@"bl_5_00" ofType:@"png"];

或

NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"bl_5_00.png"];

然后

UIImage *image=[UIImage imageWithContentsOfFile:filePath];

已编辑

要检查文件是否在您的资产中，请不要尝试以下技巧只需添加

To check whether the file is in your asset or, not try the following trick just add

NSLog(@"%@",[[NSBundle mainBundle] pathForResource:@"bl_5_00" ofType:@"png"]);

如果存在，它会记录图像的完整路径，我怀疑它没有添加到你的包中，所以它不会加载，如果图像不存在，你会得到 (null).尝试重新添加图像并重新构建应用程序.

It will log the full path of the image if exist, I suspect it is not added in your bundle so its not loading, you will get (null) if image doesn't exist. Try to re-add the image and clean build the app again.

希望有帮助.干杯.

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