Ios NSLayoutConstraint和MKMapView
在我的viewDidLoad方法中,我有创建MKMapView、一些约束和UIToolbar的代码: 我有一个MKMapView:Ios NSLayoutConstraint和MKMapView,ios,objective-c,nslayoutconstraint,Ios,Objective C,Nslayoutconstraint,在我的viewDidLoad方法中,我有创建MKMapView、一些约束和UIToolbar的代码: 我有一个MKMapView: MKMapView *mapView = [[MKMapView alloc] init]; [mapView setTranslatesAutoresizingMaskIntoConstraints:NO]; mapView.userInteractionEnabled = TRUE; mapView.showsUserLocation = TRUE; mapVi
MKMapView *mapView = [[MKMapView alloc] init];
[mapView setTranslatesAutoresizingMaskIntoConstraints:NO];
mapView.userInteractionEnabled = TRUE;
mapView.showsUserLocation = TRUE;
mapView.mapType = MKMapTypeHybrid;
mapView.delegate = self;
[mapView setUserTrackingMode:MKUserTrackingModeFollow animated:YES];
[self.view addSubview:mapView];
我创建了两个约束以使其全屏显示:
NSMutableArray *constraints = [NSMutableArray array];
[constraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[mapView]|"
options:0
metrics:nil
views:NSDictionaryOfVariableBindings(mapView)]];
[constraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"|[mapView]|"
options:0
metrics:nil
views:NSDictionaryOfVariableBindings(mapView)]];
[self.view addConstraints:constraints];
效果很好。但当我尝试向地图视图添加任何内容时:
UIToolbar *topBar = [[UIToolbar alloc ]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 44)];
[topBar setTranslatesAutoresizingMaskIntoConstraints:NO];
topBar.barStyle = UIBarStyleBlackTranslucent;
[mapView addSubview:topBar];
它抛出一个错误:
*** Assertion failure in -[MKMapView layoutSublayersOfLayer:], /SourceCache/UIKit_Sim/UIKit-2372/UIView.m:5776
2013-01-10 10:24:17.503 Landscout 2[2001:14003] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Auto Layout still required after executing -layoutSubviews. MKMapView's implementation of -layoutSubviews needs to call super.'
据我所知,由于我正在向地图视图添加一个新视图,地图视图需要重新计算其中的所有约束?基本上是约束的drawRect方法
我如何解决这个问题?我通过简单地使用内容视图将所有内容填充到中解决了这个问题。我没有将工具栏添加到myMapView,而是将其添加到myContentView 我很确定MKMapView还没有设置为使用约束。MapView不会调用
[super layoutSubviews]
,这最终会导致[UIView layoutSubviews]
我想象的另一个可能的解决方案是向MKMapView添加一个类别,该类别将覆盖
-layoutSubview
以调用[super layoutSubview]
,但我不知道如何找出[MKMapView layoutSubview]中的其他内容
我需要添加。您使用哪种方法创建UIToolbar*topBar
并将其添加为子视图?代码都在viewDidLoad方法中。是的-无法向MKMapView添加约束。如果您找到与您相同的帖子,可能会对阅读感兴趣。