MapView：使用 MKUserTrackingBarButtonItem 切换地图跟踪状态答案

【问题标题】：MapView: Use MKUserTrackingBarButtonItem to toggle map tracking stateMapView：使用 MKUserTrackingBarButtonItem 切换地图跟踪状态
【发布时间】：2011-12-03 03:23:10
【问题描述】：

我已将 MKUserTrackingBarButtonItem 添加到我的工具栏。但是，点击它什么也没做。所以，我假设我需要像普通 UIBarButtonItem 一样使用addTarget，但这也不起作用。

如何将方法附加到该按钮，以便更改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];

【问题讨论】：

标签： iphone objective-c ios mkmapview mapkit

【解决方案1】：

我认为你应该用这个方法初始化 MKUserTrackingBarButtonItem：

– initWithMapView:

参考文档：http://developer.apple.com/library/ios/#documentation/MapKit/Reference/MKUserTrackingBarButtonItemClassRef/Reference/Reference.html

【讨论】：

【解决方案2】：

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

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

【讨论】：