uiview

问题 I am able to create triangle view in swift using below code- class TriangleView: UIView { override func draw(_ rect: CGRect) { // Get Height and Width let layerHeight = layer.frame.height let layerWidth = layer.frame.width // Create Path let bezierPath = UIBezierPath() // Draw Points bezierPath.move(to: CGPoint(x: 0, y: layerHeight)) bezierPath.addLine(to: CGPoint(x: layerWidth, y: layerHeight)) bezierPath.addLine(to: CGPoint(x: layerWidth / 2, y: 0)) bezierPath.addLine(to: CGPoint(x: 0, y:

问题 I want to make a UIView have an effect of transparent gradient from the middle to the left and right. Like in this example: The word 籍 has the desired effect. This view is achieved by the class MarqueeLabel. I examined the source code, it is likely implemented by class CALayer . 回答1: You can use CAGradientLayer as following. gradientLayer = [CAGradientLayer layer]; gradientLayer.frame = baseView.bounds; gradientLayer.startPoint = CGPointMake(0.5,0.0); gradientLayer.endPoint = CGPointMake(0.5

问题 I want to make a UIView have an effect of transparent gradient from the middle to the left and right. Like in this example: The word 籍 has the desired effect. This view is achieved by the class MarqueeLabel. I examined the source code, it is likely implemented by class CALayer . 回答1: You can use CAGradientLayer as following. gradientLayer = [CAGradientLayer layer]; gradientLayer.frame = baseView.bounds; gradientLayer.startPoint = CGPointMake(0.5,0.0); gradientLayer.endPoint = CGPointMake(0.5

问题 I want to make a UIView have an effect of transparent gradient from the middle to the left and right. Like in this example: The word 籍 has the desired effect. This view is achieved by the class MarqueeLabel. I examined the source code, it is likely implemented by class CALayer . 回答1: You can use CAGradientLayer as following. gradientLayer = [CAGradientLayer layer]; gradientLayer.frame = baseView.bounds; gradientLayer.startPoint = CGPointMake(0.5,0.0); gradientLayer.endPoint = CGPointMake(0.5

问题 image 1 image 2 As you see, i have storyboard like in pic 1, but in simulator it looks like in pic 2. How can i make it, thats this tableView inside View will be fullsized if contains some data. If not - it will be hidden. At this moment, if its contains some data, UIview doesnt change the height and uitableview is almost not visible. This lines didnt help: tableView.estimatedRowHeight = 44.0 tableView.rowHeight = UITableView.automaticDimension ------------------part 2--------here is code of

问题 image 1 image 2 As you see, i have storyboard like in pic 1, but in simulator it looks like in pic 2. How can i make it, thats this tableView inside View will be fullsized if contains some data. If not - it will be hidden. At this moment, if its contains some data, UIview doesnt change the height and uitableview is almost not visible. This lines didnt help: tableView.estimatedRowHeight = 44.0 tableView.rowHeight = UITableView.automaticDimension ------------------part 2--------here is code of

问题 image 1 image 2 As you see, i have storyboard like in pic 1, but in simulator it looks like in pic 2. How can i make it, thats this tableView inside View will be fullsized if contains some data. If not - it will be hidden. At this moment, if its contains some data, UIview doesnt change the height and uitableview is almost not visible. This lines didnt help: tableView.estimatedRowHeight = 44.0 tableView.rowHeight = UITableView.automaticDimension ------------------part 2--------here is code of

问题 I've been trying to run an animation that rotates my UIButton 360 degrees using this code: UIView.animateWithDuration(3.0, animations: { self.vineTimeCapButton.transform = CGAffineTransformMakeRotation(CGFloat(M_PI*2)) self.instagramTimeCapButton.transform = CGAffineTransformMakeRotation(CGFloat(M_PI*2)) }) However, it doesn't rotate 360 degrees because the UIButton is already at that location. How can I rotate my UIButton 360 degrees? 回答1: You can use a trick: start rotating with 180 degrees

问题 I have a UIButton . It has two subviews. I then call: [createButton addTarget:self action:@selector(openComposer) forControlEvents:UIControlEventTouchUpInside]; If I tap the parts of the UIButton that aren't covered but one of its subviews, it works fine. However if I tap one of the subviews instead, it does not trigger the action. On both subviews, I has .userInteractionEnabled set to YES . Both subviews are plain UIViews s with a frame and backgroundColor . How can I get the tap to "pass

问题 I have a UIButton . It has two subviews. I then call: [createButton addTarget:self action:@selector(openComposer) forControlEvents:UIControlEventTouchUpInside]; If I tap the parts of the UIButton that aren't covered but one of its subviews, it works fine. However if I tap one of the subviews instead, it does not trigger the action. On both subviews, I has .userInteractionEnabled set to YES . Both subviews are plain UIViews s with a frame and backgroundColor . How can I get the tap to "pass