自动布局约束不适用于使用drawRect的NSView组合： [英] Autolayout constraints do no work for NSView composition with drawRect:

问题描述

我想尝试应用 Autolayout 约束到继承自 NSView 的自定义按钮。按钮是相当复杂的，可以用作例如单选按钮。用户界面由 drawRect：组成，您可以从以下代码片段中猜出。

I am trying to apply Autolayout constraints to a custom button which inherits from NSView. The button is rather complex and can be used as radio button for example. The user interface is composed in drawRect: as you can guess from the following code excerpt.

@interface CustomButton : NSView

...

- (void)drawRect:(NSRect)dirtyRect {
    // ...
    if (self.hasImage) {
        // ...
        if (self.hasTitle) {
            // ...
            [image drawInRect:imgRect
                     fromRect:NSZeroRect
                    operation:NSCompositeSourceOver
                     fraction:fraction
                    alignment:Alignment_LEFT];
        } else {
            [image drawInRect:imgRect
                     fromRect:NSZeroRect
                    operation:NSCompositeSourceOver
                     fraction:fraction
                    alignment:Alignment_CENTER];
        }
    }
    if (self.hasTitle) {
        // ...
        [self.textRenderer drawText:m_title
                         inRect:textRect
                      withState:state
                    controlView:self];
    }
}

我已成功配置自定义文本字段。区别在于文本字段使用 addSubView：来组成其用户界面组件。

I successfully configured a custom text field which derives from NSView. The difference is that the text field uses addSubView: to compose its user interface components.

我想知道是否仍然可以使用Autolayout约束定位用户界面组件。目前没有组件出现。我感觉它不工作，因为我画这些子视图。

I wonder if it still possible to use Autolayout constraints to position the user interface components. In the moment no component shows up. I have the feeling that it does not work because I draw those "subviews".

推荐答案

我设法解决问题， 在 CustomButton 中的 intrinsicContentSize 。

I managed to solve the problem by implementing the intrinsicContentSize in CustomButton.

#pragma mark - NSConstraintBasedLayoutFittingSize

/**
    Returns a suitable size for the receiver.
    This settings may not apply if a layout constraint
    defines minimum values for the width or height of the element.
    @returns A size for the receiver.
 */
- (NSSize)intrinsicContentSize {
    // Calculation of width and height of the rendered text.
    return NSMakeSize(width, height);
}

这篇关于自动布局约束不适用于使用drawRect的NSView组合：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！