在Swift中不带动画的初始子视图旋转
我希望在子视图中有缩放动画(在本例中是UILabel),但设置初始旋转而不设置动画。问题是,它将从初始旋转设置为0度的动画在Swift中不带动画的初始子视图旋转,swift,animation,uiview,rotation,uilabel,Swift,Animation,Uiview,Rotation,Uilabel,我希望在子视图中有缩放动画(在本例中是UILabel),但设置初始旋转而不设置动画。问题是,它将从初始旋转设置为0度的动画 recordedTime?.transform = CGAffineTransform(scaleX: 0.1, y: 0.1) recordedTime?.transform = CGAffineTransform(rotationAngle: 90 * (.pi/180)) view.addSubview(record
recordedTime?.transform = CGAffineTransform(scaleX: 0.1, y: 0.1)
recordedTime?.transform = CGAffineTransform(rotationAngle: 90 * (.pi/180))
view.addSubview(recordedTime!)
UIView.animate(withDuration: 0.50, delay: 0.0, options: [], animations: {
recordedTime?.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)
}, completion:nil)
我想我可以在动画中重复旋转变换,但这似乎是多余的,而且我的实际代码更复杂,因为它检查我的屏幕方向,所以我不希望代码再次重复
我想我可以在动画中重复旋转变换,但这似乎是多余的
但这不是多余的。由于视图的旋转和缩放在相同的transform
属性中编码,因此您别无选择:必须始终将transform
属性设置为包含所需的旋转和缩放
您可以创建属性以分别存储旋转和缩放,然后基于这些属性计算变换
:
class ViewController: UIViewController {
@IBOutlet var recordedTime: UILabel!
private var recordedTimeRotation: CGFloat = 0 {
didSet { updateRecordedTimeTransform() }
}
private var recordedTimeScale: CGFloat = 1 {
didSet { updateRecordedTimeTransform() }
}
private func updateRecordedTimeTransform() {
var transform: CGAffineTransform = .identity
transform = transform.rotated(by: recordedTimeRotation)
transform = transform.scaledBy(x: recordedTimeScale, y: recordedTimeScale)
recordedTime?.transform = transform
}
private func run() {
recordedTimeScale = 0.1
recordedTimeRotation = .pi / 2
view.addSubview(recordedTime!)
UIView.animate(withDuration: 0.50, delay: 0.0, options: [], animations: {
recordedTimeScale = 1
}, completion:nil)
}
}