小编Osa*_*ahM的帖子

如何更换字符串NSURL？我尝试过,stringByReplacingOccurrencesOfString但它适用NSString.

NSURL *imageURL = [NSURL URLWithString:dataList[indexPath.item][@"image"]];
NSData *imageData = [NSData dataWithContentsOfURL:imageURL];
UIImage *image = [UIImage imageWithData:imageData];

我想替换图片网址

http://example.com/image1.jpg

至

http://example.com/img1.jpg

我在 Android 中遇到 react-native 问题（无法获得 BatchedBridge，请确保您的包已正确打包）[![在此处输入图片描述][1]][1]

我尝试了一切：将 npm、react-native、react 和 package.json 中的所有依赖项更新到最新版本，我删除了 node_modules 并重新安装了它，清除了缓存 ... atc

错误日志

 04-25 03:35:49.874 11688-11814/com.test.store E/AndroidRuntime: FATAL EXCEPTION: mqt_js
                                                            Process: com.test.store, PID: 11688
                                                            java.lang.RuntimeException: com.facebook.react.devsupport.JSException: Could not get BatchedBridge, make sure your bundle is packaged correctly
                                                                at com.facebook.react.bridge.DefaultNativeModuleCallExceptionHandler.handleException(DefaultNativeModuleCallExceptionHandler.java:24)
                                                                at com.facebook.react.devsupport.DisabledDevSupportManager.handleException(DisabledDevSupportManager.java:161)
                                                                at com.facebook.react.cxxbridge.CatalystInstanceImpl.onNativeException(CatalystInstanceImpl.java:465)
                                                                at com.facebook.react.cxxbridge.CatalystInstanceImpl.access$400(CatalystInstanceImpl.java:51)
                                                                at com.facebook.react.cxxbridge.CatalystInstanceImpl$NativeExceptionHandler.handleException(CatalystInstanceImpl.java:481)
                                                                at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:33)
                                                                at android.os.Looper.loop(Looper.java:154)
                                                                at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:196)
                                                                at java.lang.Thread.run(Thread.java:761)
                                                             Caused by: com.facebook.react.devsupport.JSException: Could not get BatchedBridge, make sure your bundle is packaged correctly
                                                                at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
                                                                at android.os.Handler.handleCallback(Handler.java:751)
                                                                at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                at …

如何从另一个类访问变量或数组

我想dName在class2中使用价值

1级

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    class1 *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];

    // Configure the cell

    NSString *dName = [self.menuNames objectAtIndex:indexPath.item];

    cell.titleLabel.text = dName;
        [cell cellProperties:dName]

    return cell;
}

2级

{
self = [super initWithFrame:frame];
if (self) {
    // Title ( image name )
    self.titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, frame.size.width, frame.size.height)];
    self.titleLabel.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
    self.titleLabel.textAlignment = NSTextAlignmentCenter;
    self.titleLabel.font = [UIFont boldSystemFontOfSize:10.0];
    self.titleLabel.backgroundColor = [UIColor clearColor];
    self.titleLabel.textColor = [UIColor whiteColor];
    [self.contentView addSubview:self.titleLabel]; …