基本原理知识iOS DeveloperiOS 开发

View Hierarchy

2016-03-17  本文已影响486人  Monkey_ALin

前言

Debug View Hierarchy

View Hierarchy详解

View Hierarchy
@property(nullable, nonatomic,readonly) UIView       *superview;
@property(nonatomic,readonly,copy) NSArray<__kindof UIView *> *subviews;
@property(nullable, nonatomic,readonly) UIWindow     *window;

ios attempt to present whose view is not in the window hierarchy和Warning: Attempt to present on whose view is not in the window hierarchy!

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