Xcode顯示沖突約束

Question

我有一個主要由2個視圖組成的視圖控制器。 一個具有前導，尾隨和底錨與Superview和比例高度對齊的Superview（0.25），以及一個滾動視圖，將前導頂和尾隨與Superview /安全區域和底端對齊。

我在xib文件中定義了一個視圖，該視圖使用Bundle.main.loadNibNamed("VariantResultSlide", owner: self, options: nil)?.first創建多次，並將它們添加到數組slides 。 我想將它們添加到ScrollView中：

for i in 0 ..< slides.count {
    scrollView.addSubview(slides[i])

    NSLayoutConstraint.activate([
        slides[i].leadingAnchor.constraint(equalTo: (i==0) ? scrollView.leadingAnchor : slides[i-1].trailingAnchor),
        slides[i].topAnchor.constraint(equalTo: scrollView.topAnchor),
        slides[i].bottomAnchor.constraint(equalTo: scrollView.bottomAnchor),
        slides[i].widthAnchor.constraint(equalTo: scrollView.widthAnchor),
        slides[i].heightAnchor.constraint(equalTo: scrollView.heightAnchor)
    ])
    if(i==slides.count-1) {
        NSLayoutConstraint.activate([slides[i].trailingAnchor.constraint(equalTo: scrollView.trailingAnchor)])
    }
    self.updateResultSlides(index: i, vehicle: orderedVehiclesList[i])
}

但是隨后Xcode給我類似以下錯誤：

2019-04-11 13:57:07.219263+0200 FleetView[545:190663] [LayoutConstraints] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. 
    Try this: 
        (1) look at each constraint and try to figure out which you don't expect; 
        (2) find the code that added the unwanted constraint or constraints and fix it. 
    (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSAutoresizingMaskLayoutConstraint:0x282cecbe0 h=-&- v=-&- FleetView.VariantResultSlide:0x107f214a0.height == UIScrollView:0x102919200.height + 99   (active)>",
    "<NSLayoutConstraint:0x282c92300 FleetView.VariantResultSlide:0x107f214a0.height == UIScrollView:0x102919200.height   (active)>"
)

幻燈片太大了。 但是我找不到任何為它們設置其他約束的地方。 為什么會這樣呢？

Answer 1

您的視圖實現了top ， bottom和height約束，因此很明顯，需要調整其top視圖的大小-但它不會由於自動調整蒙版自動創建的約束而導致。 在您的超級視圖中將其禁用

yourViewsSuperview.translatesAutoresizingMaskIntoConstraints = false