IOS：地圖開始於MKUserTrackingModeFollowWithHeading

Question

在我的應用程序中，我想打開一個viewcontroller裏面有一個地圖。鑑於沒有負載我這樣做：

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    annotationPointArray = [[NSMutableArray alloc]init]; 
    [self organizeMap]; 
    modalMap = TRUE; 

    [map setUserTrackingMode:MKUserTrackingModeFollowWithHeading animated:YES]; 

    [titleLabel setFont:[UIFont fontWithName:@"RemachineScriptPersonalUse" size:60]]; 
} 

你可以看到，我要開始我的應用程序有MKUserTrackingModeFollowWithHeading但它不工作，它做工精細只如果我去做了與IBAction爲，這樣的：

- (IBAction)changeVisualMap:(id)sender{ 
    if (!modalMap){ 
     modalMap = !modalMap; 
     [map setUserTrackingMode:MKUserTrackingModeFollowWithHeading animated:YES]; 
     [changeModalView_bt setImage:[UIImage imageNamed:@"map_bt_2.png"] forState:UIControlStateNormal]; 
     [changeModalView_bt setImage:[UIImage imageNamed:@"map_bt_2.png"] forState:UIControlStateHighlighted]; 
    } 
    else{ 
     modalMap = !modalMap; 
     map.userTrackingMode = MKUserTrackingModeFollow; 
     [changeModalView_bt setImage:[UIImage imageNamed:@"map_bt_1.png"] forState:UIControlStateNormal]; 
     [changeModalView_bt setImage:[UIImage imageNamed:@"map_bt_1.png"] forState:UIControlStateHighlighted]; 
    } 

} 

爲什麼？

Answer 1

viewDidLoad可能爲時過早。嘗試在viewDidAppear中設置跟蹤模式。