Repo created

iphone/Maps/Classes/Pages/PageIndicator.swift

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+
+fileprivate let kDotWidth: CGFloat = 6.0
+fileprivate let kExtraDotWidth: CGFloat = kDotWidth * 4
+
+class PageIndicator: UIView {
+  private var pageViews: [UIView] = []
+  var pageCount = 0 {
+    didSet {
+      pageViews.removeAll()
+      for _ in 0..<pageCount {
+        let v = UIView()
+        v.layer.cornerRadius = kDotWidth / 2.0
+        v.clipsToBounds = true
+        pageViews.append(v)
+        addSubview(v)
+      }
+    }
+  }
+
+  var currentPage: CGFloat = 0.0 {
+    didSet {
+      updateLayout()
+    }
+  }
+
+  var color = UIColor(white: 1.0, alpha: 0.2) {
+    didSet {
+      updateLayout()
+    }
+  }
+
+  var activeColor = UIColor(white: 1.0, alpha: 0.7) {
+    didSet {
+      updateLayout()
+    }
+  }
+
+  private func updateLayout() {
+    for i in 0..<pageCount {
+      let v = pageViews[i]
+
+      let d = CGFloat(i) - currentPage
+      let ad = abs(d)
+      let x = kDotWidth * CGFloat(i * 2) + kExtraDotWidth * min(max(0, d), 1)
+      let w = kDotWidth + kExtraDotWidth * max(0, (1 - ad))
+      v.frame = CGRect(x: x, y: 0, width: w, height: kDotWidth)
+
+      if ad >= 1 {
+        v.backgroundColor = color
+      } else {
+        v.backgroundColor = UIColor.intermediateColor(color1: activeColor, color2: color, ad)
+      }
+    }
+  }
+
+  override func layoutSubviews() {
+    super.layoutSubviews()
+    updateLayout()
+  }
+
+  override var intrinsicContentSize: CGSize {
+    let w = (pageCount > 0) ? (kExtraDotWidth + kDotWidth * CGFloat((pageCount - 1) * 2 + 1)) : 0
+    return CGSize(width: w, height: kDotWidth)
+  }
+}