前言
开发中总因为一些比较蛋疼的导角问题而困扰着我们,尤其是我们要给一个uiview导角成 左上 、左下。。。
这种需求很值得用代码实现一下, 今天突然在appcode找到了一篇好文章.于是有了下文
通常导角
|
1
2
|
self.view.cornerradius = 20.0
self.view.cliptobounds = true
|
这两行代码是全方向导角
如果像要搞成不同方向的话可以用ios11 新的api和 ios11以前的cashapelayer画贝赛尔曲线来解决
首先我们要创建一个uiview
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
class viewcontroller: uiviewcontroller {
var cardview: uiview!
override func viewdidload() {
super.viewdidload()
cardview = uiview()
view.addsubview(cardview)
cardview.translatesautoresizingmaskintoconstraints = false
//把view居中
cardview.widthanchor.constraint(equaltoconstant: 200).isactive = true
cardview.heightanchor.constraint(equaltoconstant: 200).isactive = true
cardview.centerxanchor.constraint(equalto: view.centerxanchor).isactive = true
cardview.centeryanchor.constraint(equalto: view.centeryanchor).isactive = true
cardview.backgroundcolor = uicolor(red: 1.0, green: 0.784, blue: 0.2, alpha: 1)
}
}
|
ios11 以后苹果提供了一个uiview的属性叫maskedcorners用于calayer的动画相关.
|
1
2
3
4
5
6
7
8
|
public struct cacornermask : optionset {
public init(rawvalue: uint)
public static var layerminxminycorner: cacornermask { get }
public static var layermaxxminycorner: cacornermask { get }
public static var layerminxmaxycorner: cacornermask { get }
public static var layermaxxmaxycorner: cacornermask { get }
}
|
下面我说一下
- layerminxminycorner 底部右侧 的圆角 -> 右下角
- layermaxxminycorner 顶部右侧 的圆角 -> 右上角
- layerminxmaxycorner 底部左侧 的圆角 -> 左下角
- layerminxminycorner 顶部左侧 的圆角 -> 左上角
一般我们都为uiview写个 extension
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
extension uiview {
func roundcorners(cornerradius: double) {
self.layer.cornerradius = cgfloat(cornerradius)
self.clipstobounds = true
if #available(ios 11.0, *) {
self.layer.maskedcorners = [.layerminxminycorner, .layermaxxminycorner]
} else {
let path = uibezierpath(roundedrect: self.bounds, byroundingcorners: [.topleft, .topright], cornerradii: cgsize(width: cornerradius, height: cornerradius))
let masklayer = cashapelayer()
masklayer.frame = self.bounds
masklayer.path = path.cgpath
self.layer.mask = masklayer
}
}
}
|
这里区分了ios11之前和之后的两种搞法.
之前的话我们都是用一个贝塞尔曲线画path.然后创建cashapelayer 给self.layer.mask做一种透明的遮罩来解决不同方向导角问题.
添加动画效果的导角
我们在原viewdidload()方法里面加个手势.
并写好触发的事件, 完整的代码如下
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
import uikit
class viewcontroller: uiviewcontroller {
var cardview: uiview!
override func viewdidload() {
super.viewdidload()
cardview = uiview()
view.addsubview(cardview)cardview.translatesautoresizingmaskintoconstraints = false
cardview.widthanchor.constraint(equaltoconstant: 200).isactive = true
cardview.heightanchor.constraint(equaltoconstant: 200).isactive = true
cardview.centerxanchor.constraint(equalto: view.centerxanchor).isactive = true
cardview.centeryanchor.constraint(equalto: view.centeryanchor).isactive = true
cardview.backgroundcolor = uicolor(red: 1.0, green: 0.784, blue: 0.2, alpha: 1)
let taprecognizer = uitapgesturerecognizer(target: self, action: #selector(animatecornerchange(recognizer:)))
cardview.addgesturerecognizer(taprecognizer)
}
@objc func animatecornerchange(recognizer: uitapgesturerecognizer) {
let targetradius: double = (cardview.layer.cornerradius == 0.0) ? 100.0:0.0
if #available(ios 10.0, *) {
uiviewpropertyanimator(duration: 0.4, curve: .easeinout) {
self.cardview.roundcorners(cornerradius: targetradius)
}.startanimation()
} else {
uiview.animate(withduration: 1.0, delay: 0.0, options: .curveeaseinout, animations: {
}, completion: nil)
}
}
}
extension uiview {
func roundcorners(cornerradius: double) {
self.layer.cornerradius = cgfloat(cornerradius)
self.clipstobounds = true
if #available(ios 11.0, *) {
self.layer.maskedcorners = [.layerminxminycorner, .layermaxxminycorner]
} else {
let path = uibezierpath(roundedrect: self.bounds, byroundingcorners: [.topleft, .topright], cornerradii: cgsize(width: cornerradius, height: cornerradius))
let masklayer = cashapelayer()
masklayer.frame = self.bounds
masklayer.path = path.cgpath
self.layer.mask = masklayer
}
}
}
|
这里主要强调一下动画的新api
ios10之后u增加一个新的动画效果api
|
1
2
3
4
|
uiviewpropertyanimator(duration: 0.4, curve: .easeinout) {
//这里写相关view的操作代码 。。。eg:下面代码
self.cardview.roundcorners(cornerradius: targetradius)
}.startanimation()
|
ios之前可以通过古老的api来实现
|
1
2
3
4
|
uiview.animate(withduration: 1.0, delay: 0.0, options: .curveeaseinout, animations: {
//这里写相关view的操作代码 。。。eg:下面代码
self.cardview.roundcorners(cornerradius: targetradius)
}, completion: nil)
|
最终的效果
总结
ios一些简单的动画导角比较常用所以记录下来,以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对服务器之家的支持。
原文链接：https://www.sunyazhou.com/2018/05/15/20180515How-to-Create-Top-or-Bottom-Rounded-Corners-for-Views/