我有一个自定义视图,其中有两个标签垂直排布。该视图的初始化方法如下:
self.locationView = LocationView(frame: CGRect.zero)
为了将子视图定位在主视图中,我使用以下约束:
self.gMapsView.addConstraints(
NSLayoutConstraint.constraints(
withVisualFormat: "H:|-[locationView]-|",
options: NSLayoutFormatOptions(rawValue: UInt(0)),
metrics: nil,
views: views
)
)
self.gMapsView.addConstraints(
NSLayoutConstraint.constraints(
withVisualFormat: "V:[locationView]-(paddingBottom)-|",
options: NSLayoutFormatOptions(rawValue: UInt(0)),
metrics: [
"paddingBottom": LOCATION_VIEW_CONFIG.paddingBottom
],
views: views
)
)
为在位置视图中定位标签,我使用以下约束:
self.addConstraints(
NSLayoutConstraint.constraints(
withVisualFormat: "H:|[streetLabel]|",
options: NSLayoutFormatOptions(rawValue: UInt(0)),
metrics: nil,
views: views
)
)
self.addConstraints(
NSLayoutConstraint.constraints(
withVisualFormat: "H:|[cityLabel]|",
options: NSLayoutFormatOptions(rawValue: UInt(0)),
metrics: nil,
views: views
)
)
self.addConstraints(
NSLayoutConstraint.constraints(
withVisualFormat: "V:|-[streetLabel]-[cityLabel]-|",
options: NSLayoutFormatOptions(rawValue: UInt(0)),
metrics: nil,
views: views
)
)
不幸的是,我收到了约束警告:
(
"<NSAutoresizingMaskLayoutConstraint:0x608000280820 h=--& v=--& Test.LocationView:0x7fdc40f0c780.height == 0 (active)>",
"<NSLayoutConstraint:0x608000280190 UILabel:0x7fdc40f0cb40.top == Test.LocationView:0x7fdc40f0c780.topMargin (active)>",
"<NSLayoutConstraint:0x608000280320 V:[UILabel:0x7fdc40f0cb40]-(NSSpace(8))-[UILabel:0x7fdc40d155e0] (active)>",
"<NSLayoutConstraint:0x6080002802d0 Test.LocationView:0x7fdc40f0c780.bottomMargin == UILabel:0x7fdc40d155e0.bottom (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x608000280320 V:[UILabel:0x7fdc40f0cb40]-(NSSpace(8))-[UILabel:0x7fdc40d155e0] (active)>
如何修复它们?非常感谢 :)