小编Joh*_*tty的帖子

在我的iPhone应用程序中,我将我的uiwebview的委托设置为文件所有者,但它没有调用uiscrollviewdelegate方法

我的代码是

- (void)webViewDidStartLoad:(UIWebView *)webView{
    NSLog(@"webViewDidStartLoad  ");
}

- (void)webViewDidFinishLoad:(UIWebView *)webView{
     NSLog(@"webViewDidFinishLoad  ");
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

     NSLog(@"scrollViewDidEndDecelerating  ");
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{

    NSLog(@"scrollViewDidScroll  ");
}

但我得到了

webViewDidStartLoad
webViewDidFinishLoad

控制台中的这些消息.

我是怎么了

提前致谢

我正在开发一个cocos2d应用程序,我需要集成youtube API才能将视频上传到youtube.我已经集成了从这里下载的gdata api .并更改了项目设置如下.

设置其他链接器标志:-lxml2

其他C标志:-DDEBUG = 1

C语言方言:C99 [-std = c99]

添加了标题搜索路径:/ usr/include/libxml2并添加了libxml2.dlyb

但是当我构建项目时收到以下错误消息

Undefined symbols for architecture i386:
  "_SCNetworkReachabilityCreateWithName", referenced from:
      -[GDataOAuthSignIn startReachabilityCheck] in GDataOAuthSignIn.o
  "_SCNetworkReachabilitySetCallback", referenced from:
      -[GDataOAuthSignIn startReachabilityCheck] in GDataOAuthSignIn.o
      -[GDataOAuthSignIn stopReachabilityCheck] in GDataOAuthSignIn.o
  "_SCNetworkReachabilityScheduleWithRunLoop", referenced from:
      -[GDataOAuthSignIn startReachabilityCheck] in GDataOAuthSignIn.o
  "_SCNetworkReachabilityUnscheduleFromRunLoop", referenced from:
      -[GDataOAuthSignIn stopReachabilityCheck] in GDataOAuthSignIn.o
  "_SecItemCopyMatching", referenced from:
      -[GDataOAuthKeychain passwordForService:account:error:] in GDataOAuthViewControllerTouch.o
  "_SecItemDelete", referenced from:
      -[GDataOAuthKeychain removePasswordForService:account:error:] in GDataOAuthViewControllerTouch.o
  "_SecItemAdd", referenced from:
      -[GDataOAuthKeychain setPassword:forService:account:error:] in GDataOAuthViewControllerTouch.o
  "_kSecAttrAccount", referenced from:
      +[GDataOAuthKeychain keychainQueryForService:account:] …

我的项目使用ARC,我想使用不兼容ARC的GDATA api.我知道如何为单个文件禁用ARC(通过为这些文件添加-fno-objc-arc编译器标志).但是在GDataObject.h文件中有一个结构防御

typedef struct GDataDescriptionRecord {
    NSString *label;
    NSString *keyPath;
    enum GDataDescRecTypes reportType;
} GDataDescriptionRecord;

它会导致错误

ARC forbids object in struct or union

我怎样才能避免这个问题.是否有任何ARC兼容的GDATA api可用或以任何方式禁用.h文件的弧

我ViewController.modalPresentationStyle = UIModalPresentationPopover;从左侧按钮操作呈现一个弹出控制器(带).在右键按钮动作中,我触发推送segue.理想情况下,当弹出窗口可见时,不应该发生与弹出窗口后面的视图的交互.但是,即使弹出窗口可见,我也可以单击右侧栏按钮并按下新视图控制器而不会忽略弹出窗口.

我的代码是

- (UIViewController *)menuViewController {
    if (!_menuViewController) {
        _menuViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"TableViewController"];
        _menuViewController.modalPresentationStyle = UIModalPresentationPopover;
        UIPopoverPresentationController *popoverPresentationController = _menuViewController.popoverPresentationController;
        popoverPresentationController.permittedArrowDirections = UIPopoverArrowDirectionUp;
    }
    return _menuViewController;
}
- (IBAction)leftAction:(id)sender {
    self.menuViewController.popoverPresentationController.barButtonItem = sender;

    [self presentViewController:self.menuViewController animated:YES completion:nil];
}
- (IBAction)rightAction:(id)sender {
    [self performSegueWithIdentifier:@"PushSegue" sender:nil];
    NSLog(@"Crap here");
}

我尝试将popover表示控制器设置passthroughViews为nill和空数组,但没有结果

如何在弹出窗口可见时禁用所有交互？

更新:

如果弹出窗口可见并且我们在导航栏中有任何交互,则会发生这种情况.简而言之,即使弹出窗口可见,它也会与导航栏进行交互.有没有办法禁用它？

我想将一系列图像转换为iphone中的视频

任何人都可以为此提出方法或框架.

谢谢你们

对于我的cocos 2D游戏,我想从iphone的麦克风中检测语音,它应该自动播放,我正在使用avaudiorecorder的peakPowerForChannel代码:

const double ALPHA = 0.05;
    NSString *currentRecorder=@"nil";
            NSError *error;
    if(checker.recording){
        [checker updateMeters];
        currentRecorder=@"checker";
        peakPowerForChannel = pow(10, (ALPHA* [checker peakPowerForChannel:0]));
    }
    else if (recorder.recording) {
        [recorder updateMeters];
        peakPowerForChannel = pow(10, (ALPHA * [recorder peakPowerForChannel:0]));
         currentRecorder=@"recorder";
    }
   // NSLog(@"-------------- %f",lowPassResults);
    lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * lowPassResults;  
    NSLog(@"%@ >>>>>>>>>>>>>>>>>>>>>> %f   peakPowerForChannel ---%f",currentRecorder,lowPassResults,peakPowerForChannel);
  if (lowPassResults >0.4){
        if (!recorder.recording) {
            [checker stop];
}
    else{
        if (recorder.recording) {
            [recorder stop];
 [checker record];

        }
    }

它第一次工作正常.播放音频后,[recorder peakPowerForChannel:0]给出一个常数值我该如何解决这个问题

谢谢

我想在swift中遍历导航控制器的视图控制器.为此,我写了一个像这样的for循环

for navController in tabBarController?.viewControllers {
     //some process
}

tabBarController是一个UITabBarController.但我得到的错误就像'$T4??' does not have a member named 'Generator' Whats错误的代码？

我需要一个没有xib的视图控制器.应该有一个完全填充到视图的webview.为此,我已将以下代码添加到loadView方法.

- (void)loadView {
    CGRect applicationFrame = [[UIScreen mainScreen] applicationFrame];
    UIView *view = [[UIView alloc] initWithFrame:applicationFrame];

    view.translatesAutoresizingMaskIntoConstraints = NO;
    [view setBackgroundColor:[UIColor greenColor]];
    [self setView:view];
//    //create webview
    self.webview = [[UIWebView alloc] initWithFrame:CGRectZero];
    self.webview.translatesAutoresizingMaskIntoConstraints = NO;
    [view addSubview:self.webview];
    [self.webview setBackgroundColor:[UIColor orangeColor]];
    [self.webview setDelegate:self];

    NSDictionary *viewBindings = NSDictionaryOfVariableBindings(view,_webview);
//    //add constraints
    [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[_webview]|" options:0 metrics:nil views:viewBindings]];
    [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[_webview]|" options:0 metrics:nil views:viewBindings]];

}

但这会将整个视图变为黑色.如果我执行[view addConstraints:...方法调用它显示绿色视图.我的代码出了什么问题？

我有这样的JSON

{
  "images" : [
    {
      "size" : "29x29",
      "idiom" : "iphone",
      "filename" : "Icon-Small@2x.png",
      "scale" : "2x"
    }
     ......
     ......
    {
      "size" : "60x60",
      "idiom" : "iphone",
      "filename" : "Icon-60@3x.png",
      "scale" : "3x"
    }
  ],
  "info" : {
    "version" : 1,
    "author" : "xcode"
  }
}

我想遍历images数组中的每个字典.为此我写了

declare -a images=($(cat Contents.json | jq ".images[]"))
for image in "${images[@]}"
do
    echo "image --$image"
done

我期待每个字典在迭代中打印的输出.那是

image --{
  "size" : "29x29",
  "idiom" : "iphone",
  "filename" : "Icon-Small@2x.png",
  "scale" : …

当我在终端上安装 pod 时出现了这个问题。

cocoapods-core-1.7.2/lib/cocoapods-core/source/metadata.rb:15:in initialize': undefined methodwith_indifferent_access' for false:FalseClass (NoMethodError)

我想得到一个对象的类名作为我们正在使用的.这意味着现在如果我写这个代码

 NSString *s = [NSString string];
 NSLog(@"%@",[s class]);

输出是 __NSCFConstantString

我怎么能把它作为NSString自己？

注意:NSString只是一个例子

我知道 __NSCFConstantString是对的.但我的意图是变得像 NSString.有没有办法实现这个？