objective_c.md

PinLayout using Objective-C

PinLayout can also be used from Objective-C. The PinLayout interface is slightly different from the Swift interface due to more limited Objective-C parameters definitions.

Example 1:

This example implement the PinLayout's Intro example using objective-c

- (void) layoutSubviews {
    [super layoutSubviews];

    CGFloat margin = 10;
    UIEdgeInsets safeArea = self.pinObjc.safeArea;

    logo.pinObjc.topInsets(safeArea).leftInsets(safeArea).width(100).aspectRatio().margin(margin).layout();
    segmented.pinObjc.rightOfAligned(logo, VerticalAlignTop).rightInsets(safeArea).marginHorizontal(margin).layout();
    textLabel.pinObjc.belowOfAligned(segmented, HorizontalAlignLeft).widthOf(segmented).pinEdges().marginTop(margin).sizeToFitType(FitWidth).layout();
    separatorView.pinObjc.belowOfViewsAligned(@[logo, textLabel], HorizontalAlignLeft).rightToEdge(segmented.edge.right).height(1).marginTop(margin).layout();
}

📌 This example is available in the Examples App. See example complete source code

Important notes about PinLayout's Objective-c interface

pinObjc property

The PinLayout's objective-c interface is available using the property pinObjc (instead of pin in Swift)

 view.pinObjc.top().layout();

layout()

Method:

• layout()
  When using the Objective-c interface, the layout method must be called explicitly to complete the view's layout. The method will execute PinLayout commands immediately. In Swift, PinLayout executes this method implicitly, it is not necessary to call it.

 // Swift
 view.pin.width(100)

 // Objective-c
 view.pinObjc.width(100).layout();