回答編集履歴
2
修正
test
CHANGED
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@@ -101,3 +101,155 @@
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}
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```
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106
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回答追記 複数のViewの場合
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108
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109
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---
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110
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```swift
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import UIKit
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118
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class ViewController: UIViewController, UIScrollViewDelegate {
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var scrollView = UIScrollView()
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var targetViewArray: [ViewAnimation] = []
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var isAnimation = false
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override func viewDidLoad() {
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super.viewDidLoad()
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let screenSize = UIScreen.mainScreen().bounds
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scrollView.frame = screenSize
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scrollView.backgroundColor = UIColor.greenColor()
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self.scrollView.contentSize = CGSize(width: screenSize.width, height: screenSize.height * 5)
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scrollView.backgroundColor = UIColor.greenColor()
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scrollView.delegate = self
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view.addSubview(scrollView)
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let targetView = UIView(frame: CGRect(x: 20, y: 1500, width: 50, height: 100))
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targetView.backgroundColor = UIColor.redColor()
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scrollView.addSubview(targetView)
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targetViewArray.append(ViewAnimation(view: targetView))
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let targetView1 = UIView(frame: CGRect(x: 120, y: 1500, width: 50, height: 200))
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targetView1.backgroundColor = UIColor.redColor()
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scrollView.addSubview(targetView1)
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targetViewArray.append(ViewAnimation(view: targetView1))
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let targetView2 = UIView(frame: CGRect(x: 220, y: 1500, width: 50, height: 150))
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targetView2.backgroundColor = UIColor.redColor()
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scrollView.addSubview(targetView2)
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targetViewArray.append(ViewAnimation(view: targetView2))
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}
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func scrollViewDidScroll(scrollView: UIScrollView) {
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let visibleRect = CGRect(origin: scrollView.contentOffset, size: scrollView.bounds.size)
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for target in targetViewArray {
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if CGRectIntersectsRect(visibleRect, target.view.frame) {
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if !target.isAnimation {
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target.isAnimation = true
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startAnimation(target.view)
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}
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} else {
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target.isAnimation = false
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target.view.backgroundColor = UIColor.redColor()
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}
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}
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}
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func startAnimation(targetView: UIView) {
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UIView.animateWithDuration(1.5, animations: {
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targetView.backgroundColor = UIColor.yellowColor()
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})
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}
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}
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class ViewAnimation {
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var view: UIView!
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var isAnimation = false
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init(view: UIView) {
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self.view = view
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}
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}
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254
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255
|
+
```
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1
修正
test
CHANGED
|
@@ -1,4 +1,4 @@
|
|
|
1
|
-
以下を空のプロジェクトにそのまま貼り付けて実行してみてください。
|
|
1
|
+
以下のコードを空のプロジェクトにそのまま貼り付けて実行してみてください。
|
|
2
2
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3
3
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`UIScrollView`に乗せた`UIView`が画面に現れた時に背景色をアニメーションで変えています。
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4
4
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