iOS：MapKit 如何在地图上启用当前位置按钮？

Question

我正在开发一个显示地图的应用程序。在地图属性中启用了用户当前位置，现在显示了蓝色点表示用户的当前位置，但现在我想在下面图片左下角启用按钮（iPhone上的地图应用程序快照）。

请告诉我如何在地图上实现这一点。

- Azhar

---

MKUserTrackingBarButtonItem就是你需要的。尝试在谷歌上搜索。 - Pawan Rai

Answer 1

MKUserTrackingBarButtonItem *trackButton = [[MKUserTrackingBarButtonItem alloc] initWithMapView:mapView];   
[trackButton setTarget:self];
[trackButton setAction:@selector(track:)];

[toolbar setItems:[NSArray arrayWithObjects:trackButton, nil] animated:YES];

- Pawan Rai

Answer 2

您可以在这里找到此实现

iOS6MapsUserHeadingButton

以下是代码，您可以在上述链接中找到图像

//User Heading Button states images
UIImage *buttonImage = [UIImage imageNamed:@"greyButtonHighlight.png"];
UIImage *buttonImageHighlight = [UIImage imageNamed:@"greyButton.png"];
UIImage *buttonArrow = [UIImage imageNamed:@"LocationGrey.png"];

//Configure the button
userHeadingBtn = [UIButton buttonWithType:UIButtonTypeCustom];
[userHeadingBtn addTarget:self action:@selector(startShowingUserHeading:) forControlEvents:UIControlEventTouchUpInside];
//Add state images
[userHeadingBtn setBackgroundImage:buttonImage forState:UIControlStateNormal];
[userHeadingBtn setBackgroundImage:buttonImage forState:UIControlStateNormal];
[userHeadingBtn setBackgroundImage:buttonImageHighlight forState:UIControlStateHighlighted];
[userHeadingBtn setImage:buttonArrow forState:UIControlStateNormal];

//Button shadow
userHeadingBtn.frame = CGRectMake(5,425,39,30);
userHeadingBtn.layer.cornerRadius = 8.0f;
userHeadingBtn.layer.masksToBounds = NO;
userHeadingBtn.layer.shadowColor = [UIColor blackColor].CGColor;
userHeadingBtn.layer.shadowOpacity = 0.8;
userHeadingBtn.layer.shadowRadius = 1;
userHeadingBtn.layer.shadowOffset = CGSizeMake(0, 1.0f);

[self.mapView addSubview:userHeadingBtn];

- Azhar

Answer 3

你需要创建MKUserTrackingBarButtonItem并将其传递到你定义地图视图的位置。类似下面这样的东西:

  - (void)viewDidLoad
{
    [super viewDidLoad];    
    MKUserTrackingBarButtonItem *buttonItem = [[MKUserTrackingBarButtonItem alloc] initWithMapView:self.map];
    self.navigationItem.rightBarButtonItem = buttonItem;
}

- Adrian P