Ios 更新OneWLocation时保持为NULL
但我把它作为输出Ios 更新OneWLocation时保持为NULL,ios,null,cllocationmanager,Ios,Null,Cllocationmanager,但我把它作为输出 - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { NSDateFormatter * formatter = [[[NSDateFormatter alloc] init] autorelease]; [formatter setDate
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
{
NSDateFormatter * formatter = [[[NSDateFormatter alloc] init] autorelease];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm"];
NSString *latitude = [NSString stringWithFormat:@"%f", newLocation.coordinate.latitude];
NSString *longitude = [NSString stringWithFormat:@"%f", newLocation.coordinate.longitude];
NSString *stringFromDate = [formatter stringFromDate:newLocation.timestamp];
resultsLabel.text = [NSString stringWithFormat:@"(%@) %@ Location %.06f %.06f %@", ([UIApplication sharedApplication].applicationState == UIApplicationStateBackground) ? @"bg" : @"fg", resultsLabel.tag == 0 ? @"gps:" : @"sig" , newLocation.coordinate.latitude, newLocation.coordinate.longitude, [formatter stringFromDate:newLocation.timestamp]];
NSLog(@"%@", resultsLabel.text);
LocationTestAppDelegate * appDelegate = (LocationTestAppDelegate *)[UIApplication sharedApplication].delegate;
[appDelegate log:resultsLabel.text];
}
关于:
有人知道我做错了什么吗
NSLog(@"%@", resultsLabel.text);
在我的委托中,我在这里设置了resultLabel:
- (id) initWithLabel:(UILabel*)label
{
resultsLabel = label;
return [super init];
}
- (void) log:(NSString*)msg
{
NSDateFormatter * formatter = [[[NSDateFormatter alloc] init] autorelease];
[formatter setTimeStyle:NSDateFormatterMediumStyle];
NSString * logMessage = [NSString stringWithFormat:@"%@ %@", [formatter stringFromDate:[NSDate date]], msg];
NSString * fileName = [self locationPath];
FILE * f = fopen([fileName UTF8String], "at");
fprintf(f, "%s\n", [logMessage UTF8String]);
fclose (f);}
编辑
我删除了GPS功能
有人知道在新的地点如何使用正确的NSLog吗。经纬度时间戳
编辑2
我在这里设置了resultlabel:
- (id) initWithLabel:(UILabel*)label
{
resultsLabel = label;
return [super init];
}
- (void) log:(NSString*)msg
{
NSDateFormatter * formatter = [[[NSDateFormatter alloc] init] autorelease];
[formatter setTimeStyle:NSDateFormatterMediumStyle];
NSString * logMessage = [NSString stringWithFormat:@"%@ %@", [formatter stringFromDate:[NSDate date]], msg];
NSString * fileName = [self locationPath];
FILE * f = fopen([fileName UTF8String], "at");
fprintf(f, "%s\n", [logMessage UTF8String]);
fclose (f);}
@接口位置委派:NSObject
{
UILabel*结果标签;
NSString*\u电话号码;
}
-(id)initWithLabel:(UILabel*)标签;
//-(id)initWithDictionary:(NSDictionary*)dict;
//-(id)initWithName:(NSString*)aName;
//-(NSDictionary*)toDictionary;
@属性(非原子,保留)NSString*phonenumber;
您的init
代码很奇怪。这更常见:
@interface LocationDelegate : NSObject <CLLocationManagerDelegate>
{
UILabel * resultsLabel;
NSString * _phonenumber;
}
- (id) initWithLabel:(UILabel*)label;
//-(id)initWithDictionary:(NSDictionary *)dict;
//-(id)initWithName:(NSString *)aName;
//-(NSDictionary *)toDictionary;
@property (nonatomic , retain) NSString *phonenumber;
然后通过self.resultsLabel
访问我假定的实例变量
大概您的问题是当您尝试设置它的文本时,
resultslab
已经是nil
。向nil
发送消息没有任何作用,甚至不会给出错误。如何初始化结果标签?检查是否为空,我在这里设置:UILabel*resultsLabel;我在哪里检查resultsLabel=nil?NSLog(@“Results Label:%@”,resultsLabel)
,无论您想在何处实际使用该标签。您可能应该在viewDidLoad
中创建结果标签,或者使用界面生成器并连接插座。