iPad上modalPresentationStyle-FormSheet的高度到底是多少? [英] What exactly is the height of modalPresentationStyle - FormSheet on iPad?

问题描述

在iPad上，modalPresentationStyle-FormSheet的高度到底是多少?我写了一行代码来获取self.view的高度，像这样:

What exactly is the height of modalPresentationStyle - FormSheet on iPad? I wrote a line of code to get the height of self.view like this:

println("Height - modalPresentationStyle FormSheet: \(self.view.frame.size.height)")

测试后，我得到了以下两个结果:

I got these two results after testing:

在ModalViewController上没有表单，高度为 1024.0

在FormPresentationStyle上使用表格，将高度设置为 1024.0 ，这是错误的，因为高度应该小于1024.0

With Formsheet on modalPresentationStyle, height at 1024.0 which is wrong because the height is supposed to be less than 1024.0

有什么主意吗?我需要使用formsheet从self.view.frame.size.height获得正确的高度，因为我需要在代码中的某个地方编写公式.我不需要更改表单的大小.

Any idea what is wrong with it? I need to get the right height from self.view.frame.size.height with formsheet because I need to write the formula somewhere in the code. I don't need to change the size of formsheet.

推荐答案

不要在viewDidLoad内而是在viewDidAppear内实现println.

Don't implement your println inside viewDidLoad but inside viewDidAppear.

在情节提要中使用 Segue:模态呈现和演示文稿:表单工作表呈现的以下类在println给出不同的结果>，viewWillAppear或viewDidAppear:

The following class that is presented in the Storyboard with Segue: Present Modally and Presentation: Form Sheet gives different results for the same println when called in viewDidLoad, viewWillAppear or viewDidAppear:

class ViewController2: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        println(view.frame) // (0.0, 0.0, 768.0, 1024.0)
    }

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        println(view.frame) // (0.0, 0.0, 768.0, 1024.0)
    }

    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        println(view.frame) // (0.0, 0.0, 540.0, 620.0) // Correct values
    }

}

这篇关于iPad上modalPresentationStyle-FormSheet的高度到底是多少?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！