小编Luc*_*uca的帖子

我需要在我的.gitignore文件中添加一些规则,但是,我在项目文件夹中找不到它.它不是由Xcode自动创建的吗？如果没有,什么命令允许我创建一个？

我没有得到一个优化的正则表达式,它将一个字符串分成第一个空白区域:

var str="72 tocirah sneab";

我需要得到:

[
    "72",
    "tocirah sneab",
]

我想获取当前位置,但我得到一个错误.

这是我的视图控制器的片段.

- (void)viewDidLoad {
    self.locationManager = [[CLLocationManager alloc] init];
    [locationManager setDelegate:self];
    [locationManager setDesiredAccuracy:kCLLocationAccuracyNearestTenMeters];
    [locationManager startUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager 
     didUpdateLocations:(NSArray<CLLocation *> *)locations {
    // I would get the latest location here
    // but this method never gets called
}
- (void)locationManager:(CLLocationManager *)manager 
       didFailWithError:(NSError *)error {
    NSLog(@"didFailWithError: %@", error);
}

我期待委托方法locationManager:didUpdateLocations:被调用,但只是locationManager:didFailWithError:被调用,并打印出来:

didFailWithError: Error Domain=kCLErrorDomain Code=0 "The operation couldn’t be completed. (kCLErrorDomain error 0.)" 

包含一个空格的字符串长度始终等于1:

alert('My str length: ' + str.length);

空间是一个角色,所以:

str = "   ";
alert('My str length:' + str.length); // My str length: 3

如何区分空字符串和仅包含空格的字符串？如何检测仅包含空格的字符串？

我有两个表,主题和测验,这是他们的定义:

    CREATE TABLE "theme" ("id" INTEGER PRIMARY KEY  AUTOINCREMENT  NOT NULL , "nom" VARCHAR NOT NULL );

CREATE TABLE quiz(

     id              INTEGER PRIMARY KEY,
     nom         VARCHAR(256) NOT NULL,
     theme      INTEGER NOT NULL,
     niveau      INTEGER NOT NULL,
     pass          INTEGER DEFAULT 1  NOT NULL,
     jok            INTEGER DEFAULT 1 NOT NULL,
    etat            INTEGER DEFAULT 0 NOT NULL,
    FOREIGN KEY (theme) REFERENCES theme(id)
);

字段id在表(主密钥)的主题是一种Foreign Key在测验表.当我尝试在表测验中插入一个包含值30的记录,例如作为外键时,记录成功地插入到quiz表中,尽管主题表中没有记录id = 30,我的意思是,不应该因为我有一个外键约束来拦截这个插入？

当我尝试显示地图时,我得到了这个例外:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid Region <center:+inf, +0.00000000 span:+1.00000000, +0.50000000>'

我的相关代码是这样的:

-(void)viewWillAppear:(BOOL)animated
{   
    [mapView removeAnnotations:mapView.annotations];

    // locationManager update as location
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self; 
    locationManager.desiredAccuracy = kCLLocationAccuracyBest; 
    locationManager.distanceFilter = kCLDistanceFilterNone; 
    [locationManager startUpdatingLocation];
    CLLocation *location = [locationManager location];
    //Configure the new event with information from the location
    CLLocationCoordinate2D coordinate = [location coordinate];

    latitudeOfUserLocation=coordinate.latitude;
    longitudeOfUserLocation=coordinate.longitude;


    location2D = (CLLocationCoordinate2D){ .latitude = latitudeOfUserLocation, .longitude = longitudeOfUserLocation };
    MyLocation *annotation=[[[MyLocation alloc]initWithName:@"You are here" distanceVersLaStation:@"" coordinate:location2D]autorelease];
    annotation.pinColor …

当我尝试将我的应用程序从Xcode启动到设备时,我收到此错误:

error: failed to launch '/Users/Luca/Library/Developer/Xcode/DerivedData/myapp-bmsyknqfiyjuechenbmjnbfmpnsn/Build/Products/Debug-iphoneos/myapp.app/myapp' -- No such file or directory (/Users/Luca/Library/Developer/Xcode/DerivedData/myapp-bmsyknqfiyjuechenbmjnbfmpnsn/Build/Products/Debug-iphoneos/myapp.app/myapp)

我正在为我的iPhone使用Xcode 4.3.2和iOS 5.1.

我的目的是在加载视图时获取用户的经度/纬度,并将值存储在两个变量中以供以后计算.我不需要跟踪用户位置并更新它,我只需要获得他/她的坐标一次.我的代码看起来像这样:

- (void)viewDidLoad {
    [super viewDidLoad];
    // locationManager update as location
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self; 
    locationManager.desiredAccuracy = kCLLocationAccuracyBest; 
    locationManager.distanceFilter = kCLDistanceFilterNone; 
    [locationManager startUpdatingLocation];
    CLLocation *location = [locationManager location];
    // Configure the new event with information from the location
    CLLocationCoordinate2D coordinate = [location coordinate];

    float longitude=coordinate.longitude;
    float latitude=coordinate.latitude;

    NSLog(@"dLongitude : %f",longitude);
    NSLog(@"dLatitude : %f", latitude); 
}

在控制台中我一直这样:

dLongitude : 0.000000
dLatitude : 0.000000

你能帮我吗？

当我尝试构建并运行我的应用程序时,它崩溃了,我在日志中得到了这个:

reason: '[<LoadingViewController 0x6b2c5a0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key aproposViewController.'

奇怪的aproposViewController是没有使用LoadingViewController它,它只是我的应用程序中的另一个视图控制器.请帮忙,提前thx :)

编辑

appdelegate.h:

@class LoadingViewController;

@interface TopStationAppDelegate : NSObject <UIApplicationDelegate,CLLocationManagerDelegate> {
    UIWindow *window;
    LoadingViewController *loadingView;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet LoadingViewController *loadingView;
@end

appdelegate.m:

#import "LoadingViewController.h"
@implementation TopStationAppDelegate
@synthesize window;
@synthesize loadingView;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
  [window addSubview:loadingView.view];
    [window makeKeyAndVisible];
    return YES;
}
- (void)dealloc {
    [loadingView release];
    [window release]; …

标记值是整数:

UIButton *button=[UIButton buttonWithType:UIButtonTypeCustom];
[button setTitle:addressField forState:UIControlStateNormal];
[button addTarget:self action:@selector(pickTheQuiz:) forControlEvents:UIControlEventTouchUpInside];
button.tag=1;//or what other integer value, i need to put a string value

在接收方法中:

-(void)pickTheQuiz:(id)sender{           
    NSLog(@"The part number is:%i",((UIControl*)sender).tag);//i need to receive a string value instead of numeric value
}