iOS自动布局

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iOS自动布局

简单示例

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override func viewDidLoad() {
   super.viewDidLoad()
   baiduMap =  BMKMapView(forAutoLayout: {}())
   self.mapView.addSubview(baiduMap);
   self.mapView.addConstraints(self.layoutConstraints())
  
}
    
func layoutConstraints() -> [NSLayoutConstraint]{
   let views = ["map": self.baiduMap ]
   let metrics = ["margin": 0]
   var result = NSLayoutConstraint.constraintsWithVisualFormat("H:|-(margin)-[map]-(margin)-|", options:NSLayoutFormatOptions.AlignAllTop, metrics: metrics, views: views)
   result += NSLayoutConstraint.constraintsWithVisualFormat("V:|-(margin)-[map]-(margin)-|", options:NSLayoutFormatOptions.AlignAllLeft , metrics:metrics, views: views);
   return result
}