小编Vla*_*mir的帖子

我正在编写代码,允许我的iphone-app有一个"配置页面".

一个分组,滚动,UITableView ...与包含所需textFields,开关,滑块等的单元格.

这是一个非常多的代码.有没有更简单的方法？

有没有办法我可以创建一个简单的文本文件,包含我所需的所有设计选择,并让我(可重用)代码为我构建TableView？

或者......我可以在Interface Builder而不是代码中更快/更轻松地完成整个事情吗？

此代码与networkActivityIndi​​catorVisible一起使用是否正确？

- (void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];

    UIApplication* app2 = [UIApplication sharedApplication]; 
    app2.networkActivityIndicatorVisible = YES; 
    [self loadSources];  // Loads data in table view
    app2.networkActivityIndicatorVisible = NO; 
}

张志贤

如何根据字典键获取唯一值,字典键是目标C中数组的元素？

例如:

我有一个项目数组

aryItem

  aryItem[0] = Dictionary{

               ItemCategory
               ItemName
               ItemPrice

               }

  aryItem[1] = Dictionary{

               ItemCategory
               ItemName
               ItemPrice

               }

   ...........
   ...........
  aryItem[n] = Dictionary{

               ItemCategory
               ItemName
               ItemPrice

               }

现在我想获得唯一的ItemCategory,而不是重复.如果我可以写[[aryItem objectatIndex:i] valueForKey:ItemCategory]我得到所有类别,同样的类别也包括在内.我只需要独特的类别.我有一个选项搜索整个数组然后获得唯一的Itemcategory对象,但我正在寻找任何简短的方法来完成相同的事情.

谢谢.

我有一个navigationBar,它的标题上有UIImage,如下所示:

self.navigationItem.titleView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"top_logo.png"]];

当我选择一行时,不会出现"后退"按钮.为什么？

我在其他的viewControllers上有完全相同的代码,它出现了.我不明白为什么......

谢谢,

RL

我正在尝试解析保存在doc dir下面的文本文件show是它的代码

NSArray *filePaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *docDirPath=[filePaths objectAtIndex:0];
NSString *filePath=[docDirPath stringByAppendingPathComponent:@"SKU.txt"];
NSError *error;
NSString *fileContents=[NSString stringWithContentsOfFile:filePath];
NSLog(@"fileContents---%@",fileContents);   
if(!fileContents)
NSLog(@"error in reading file----%@",error);
NSArray *values=[fileContents componentsSeparatedByString:@"\n"];
NSLog(@"values-----%@",values);

NSMutableArray *parsedValues=[[NSMutableArray alloc]init];
for(int i=0;i<[values count];i++){
    NSString *lineStr=[values objectAtIndex:i];
    NSLog(@"linestr---%@",lineStr);
    NSMutableDictionary *valuesDic=[[NSMutableDictionary alloc]init];
    NSArray *seperatedValues=[[NSArray alloc]init];
    seperatedValues=[lineStr componentsSeparatedByString:@","];
    NSLog(@"seperatedvalues---%@",seperatedValues);
    [valuesDic setObject:seperatedValues forKey:[seperatedValues objectAtIndex:0]];
    NSLog(@"valuesDic---%@",valuesDic);
    [parsedValues addObject:valuesDic];
    [seperatedValues release];
    [valuesDic release];
}
NSLog(@"parsedValues----%@",parsedValues);
NSMutableDictionary *result;
result=[parsedValues objectAtIndex:1];
NSLog(@"res----%@",[result objectForKey:@"WALM-FT"]);

我面临的问题是,当我尝试打印lineStr即文本文件的数据时,它打印为单个字符串,因此我无法逐行获取内容,请帮我解决此问题.

我正在开发一个小应用程序,其中我有多个NSURLConnection.I已创建NSURL连接但我不知道如何处理它.我的代码如下所示.

-(void) loadTrafficAndEvent {    

    int a=10;
    //Get the map view bounds for fetch the travel time markers from web service
    MKCoordinateRegion region = mapView.region;

    float print = region.center.latitude;

   // NSLog(@"region.center=%g",print);



    CGPoint firstcorner = CGPointMake(self.mapView.bounds.origin.x , mapView.bounds.origin.y);
    CGPoint secondcorner = CGPointMake((self.mapView.bounds.origin.x+mapView.bounds.size.width) , mapView.bounds.origin.y);
    CGPoint thirdcorner  = CGPointMake(self.mapView.bounds.origin.x , (mapView.bounds.origin.y+ mapView.bounds.size.height));
    CGPoint fourthcorner = CGPointMake((self.mapView.bounds.origin.x+mapView.bounds.size.width), (mapView.bounds.origin.y + mapView.bounds.size.height));;


    //Then transform those point into lat,lng values
    CLLocationCoordinate2D mapfirstcorner,mapsecondcorner,mapthirdcorner,mapfourthcorner,requestsender;

    mapfirstcorner  = [mapView convertPoint:firstcorner toCoordinateFromView:mapView];
    mapsecondcorner = [mapView convertPoint:secondcorner toCoordinateFromView:mapView];
    mapthirdcorner  = [mapView convertPoint:thirdcorner toCoordinateFromView:mapView]; …

NSArray *arr=[[NSArray alloc]init]; //Am getting all immutable objects allocation that retain count:2  
NSLog(@"dic1:%d",[arr retainCount]); 
[arr retain];
[arr retain];
[arr retain];
[arr release];
 NSLog(@"dic2:%d",[arr retainCount]);


NSMutableDictionary *dic=[[NSMutableDictionary alloc]init];//Am getting all mutable objects allocation that retain count:1  
NSLog(@"dic3:%d",[dic retainCount]);
[dic retain];
[dic retain];
[dic retain];
[dic release];
NSLog(@"dic4:%d",[dic retainCount]);

输出:dic1:2 dic2:4 dic3:1 dic4:3

可变对象之间的差异是什么,保留计数和不可变对象保留计数？请给我解决方案...

我不想将方法作为参数传递给另一个方法,因此它知道在结束运行时调用的方法.可能吗？

[self bringJSON:(NSString *)_passedValua:(NSObject *)anotherMethod];

当我完成它们时,这些日期指针中的任何一个或两个都需要[发布].我怎么知道这个？我不确定,因为我没有明确地做init.

NSDate *date = [NSDate date];

NSDate *date = [dateWithTimeIntervalSince1970:100000000];

我用ASIHTTPReqeust下载文件.一切都下载得很好,但它无法将文件从临时目录移动到文档.当我实施

-(void) request:(ASIHTTPRequest *)request didReceiveData:(NSData *)data

请求失败并显示错误.但文件已下载.

如果我删除此实现,一切都很好,文件正在转移到文档.这是错误文本:

Error Domain=ASIHTTPRequestErrorDomain Code=8 "Failed to move file from '/var/folders/Qu/Qu0o0VcpEY4npJr2C1yPzE+++TI/-Tmp-/Skrillex feat. Nero - Wobbleland.mp3' to '/Users/Timur/Library/Application Support/iPhone Simulator/4.3/Applications/34389282-4013-4354-95D9-DF2847B4EE55/Documents/Audio/Skrillex feat. Nero - Wobbleland.mp3'" UserInfo=0x5949520 {NSUnderlyingError=0x59992a0 "The operation couldn’t be completed. (Cocoa error 4.)", NSLocalizedDescription=Failed to move file from '/var/folders/Qu/Qu0o0VcpEY4npJr2C1yPzE+++TI/-Tmp-/Skrillex feat. Nero - Wobbleland.mp3' to '/Users/Timur/Library/Application Support/iPhone Simulator/4.3/Applications/34389282-4013-4354-95D9-DF2847B4EE55/Documents/Audio/Skrillex feat. Nero - Wobbleland.mp3'}

谁有类似的问题？