【Sample Code】Custom Segue

最新推荐文章于 2018-05-03 16:00:20 发布

Cyaninreality1975

最新推荐文章于 2018-05-03 16:00:20 发布

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分类专栏：【iOS】【Resources】Sample Code 【Topics】General

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本文详细介绍了iOS应用中Segue对象的生命周期及其工作原理。从Segue对象的创建到释放，再到如何通过自定义Segue来实现特定的视图控制器过渡效果，包括动画和其他增强功能。

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The Life Cycle of a Segue

To understand how custom segues work, you need to understand the life cycle of a segue object. Segue objectsare instances ofUIStoryboardSegueor one of its subclasses. Your app never creates segue objects directly;they are always created on your behalf by iOS when a segue is triggered. Here’s what happens:

The destination controller is created and initialized.
The segue object is created and itsinitWithIdentifier:source:destination:method is called.The identifier is the unique string you provided for the segue in Interface Builder, and the two otherparameters represent the two controller objects in the transition.
The source view controller’s prepareForSegue:sender:method is called. See “Configuring theDestination Controller When a Segue is Triggered”(page 101).
The segue object’s performmethod is called. This method performs a transition to bring the destinationview controller on-screen.
The reference to the segue object is released, causing it to be deallocated.

Implementing a Custom Segue

To implement a custom segue, you subclassUIStoryboardSegueand implement the two methods describedearlier:

If you override the initWithIdentifier:source:destination:method, call the superclass’simplementation, then initialize your subclass.
Your performmethod must make whatever view controller calls are necessary to perform the transitionyou want. Typically, you use any of the standard ways to display a new view controller, but you canembellish this design with animations and other effects.

<span style="font-size:18px;">- (void)perform
{
// Add your own animation code here.
    [[self sourceViewController] presentModalViewController:[self
destinationViewController] animated:NO];
}</span>