MapView：使用MKUserTrackingBarButtonItem切换地图跟踪状态 [英] MapView: Use MKUserTrackingBarButtonItem to toggle map tracking state

问题描述

我在工具栏中添加了MKUserTrackingBarButtonItem。但是，点击它什么都不做。所以，我假设我需要像普通的UIBarButtonItem一样使用 addTarget ，但这也不起作用。

I have added a MKUserTrackingBarButtonItem to my toolbar. But, clicking it does nothing. So, I assumed I need to use addTarget like a normal UIBarButtonItem but that doesn't work either.

我可以将方法附加到该按钮，以便我可以更改 setUserTrackingMode：animated：？

How can I attach a method to that button so that I can change setUserTrackingMode:animated:?

MKUserTrackingBarButtonItem *trackingItem = [[[MKUserTrackingBarButtonItem alloc] initWithMapView:mapView] autorelease];
    UISegmentedControl *segmentedControl = [[[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"List", @"Detail", nil]] autorelease];
    segmentedControl.frame = CGRectMake(0, 0, 220, 30);
    [segmentedControl setWidth:100.0 forSegmentAtIndex:0];
    [segmentedControl setWidth:100.0 forSegmentAtIndex:1];
    [segmentedControl setSelectedSegmentIndex:0];
    segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
    UIBarButtonItem *segmentedButton = [[[UIBarButtonItem alloc] initWithCustomView:segmentedControl] autorelease];
    UIBarButtonItem *pageCurl = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemPageCurl target:self action:nil] autorelease];
    pageCurl.tintColor = [UIColor lightGrayColor];
    UIBarButtonItem *leftFlex = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil] autorelease];
    UIBarButtonItem *rightFlex = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil] autorelease];
    self.toolbar.items = [NSArray arrayWithObjects:trackingItem, leftFlex, segmentedButton, rightFlex, pageCurl, nil];

推荐答案

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

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

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