问题的描述
我在iOS应用程序中的打印视图左侧有一个标签。我已经成功地将标签旋转了90度,如下图所示,使用以下部分中复制的代码:
但是,只要我将文本更改为"Speed (Km/h):“,标签就会变宽,如下所示:
布局
在接口构建器中没有设置相关的约束。此处设置的唯一约束是:-标签图视图的右、上和下边缘的垂直居中与视图的右、上和下边缘保持一致
其余部分在代码中设置
代码
func setup(speedArray: [Float32]) {
//Convert speed to Km/h from m/s
let speedArrayKMH = speedArray.map({$0*3.6})
//Draw Chart
//This only styles the chart (colors, user interaction, etc...
//no code in this fuction that affects layout)
setupSpeedChart(speedArray: speedArrayKMH)
//
// Customise speed label
//
//Label text
chartTitleLabel.textAlignment = .center
//Text color
self.chartTitleLabel.textColor = BoxTextColor
//Rotate
chartTitleLabel.transform = CGAffineTransform(rotationAngle: CGFloat(-Double.pi/2))
//Constrain
let C1 = NSLayoutConstraint(item: chartTitleLabel, attribute: .leadingMargin, relatedBy: .equal, toItem: self, attribute: .leading, multiplier: 1, constant: 0)
let C2 = NSLayoutConstraint(item: chartTitleLabel, attribute: .trailingMargin, relatedBy: .equal, toItem: speedLineChart, attribute: .leading, multiplier: 1, constant: 0)
NSLayoutConstraint.activate([C1, C2])
}
我尝试过的东西
我尝试了许多构造和大小组合,包括:
框架约束修复标注的框架属性(height width)
标注的宽度和高度的约束
似乎什么都不管用。
例如,为标签宽度添加以下约束会产生以下结果:
let C3 = NSLayoutConstraint(item: chartTitleLabel, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 45)
发布于 2019-04-17 07:44:44
有几个关键的东西是你忘记使用translateAutoReaizingMaskIntoConstraints时遗漏的
转到故事板,选择您的标签,转到标签下的检查器,标签下有自动收缩功能,将其设置为最小字体大小,将大小设置为11
然后在view didload中执行以下操作
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
myLabel.text = "speed in km"
myLabel.textAlignment = .center
myLabel.transform = CGAffineTransform(rotationAngle: CGFloat(-Double.pi/2))
myLabel.translatesAutoresizingMaskIntoConstraints = false
let c1 = NSLayoutConstraint(item: myLabel, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 200)
let c2 = NSLayoutConstraint(item: myLabel, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 60)
let c3 = NSLayoutConstraint(item: myLabel, attribute: .leading, relatedBy: .equal, toItem: view, attribute: .leading, multiplier: 1, constant: -60)
let c4 = NSLayoutConstraint(item: myLabel, attribute: .centerY, relatedBy: .equal, toItem: myImageView, attribute: .centerY, multiplier: 1, constant: 0)
NSLayoutConstraint.activate([c1, c2, c3, c4])
}
我试着用比以前更多的字符数将文本更新为新文本,我工作得很好
https://stackoverflow.com/questions/55717268
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