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SwiftUI 布局协议 - Part 1

: Subviews, cache: inout ()) -> CGSize { let idealViewSizes = subviews.map { $.sizeThatFits(....let spaces = computeSpaces(subviews: subviews) for idx in subviews.indices { subviews...实现 makeCache(subviews:) 创建缓存。可选的实现 updateCache(subviews:)[4]，这个方法会在检测到更改时调用。...computeMaxHeight(subviews: subviews), spaces: computeSpaces(subviews: subviews...= computeMaxHeight(subviews: subviews) cache.spaces = computeSpaces(subviews: subviews)

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【iOS】修改根控制器后，view的叠加在窗口的问题

/remove old rootViewController's sub views for (UIView* subView in self.rootViewController.view.subviews...) { if (subView.subviews.count == 0) { [subView removeFromSuperview];...} } } 由于项目是用swift编写的，然后兴冲冲的将以上代码翻译成swift语言，发现怎样都不能满足 subView.subviews.count == 0 。...经过打印子view的层级结构，发现UILayoutContainerView仍残余 UITransitionView，那么这个就是 subView.subviews.count == 0 不满足的原因。...因此，我们只要耐心等专场动画结束后，再去判断 subView.subviews.count == 0即可。

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SwiftUI 新容器视图 API 深度解析：轻松构建自定义布局

@ViewBuilder var content: Content var body: some View { ScrollView { Group(subviews...: content) { subviews in if !...subviews.isEmpty { subviews[0] .padding(.horizontal)...: content) { subviews in // 第一个子视图为大图 if !...subviews.isEmpty { subviews[0] .padding(.horizontal)

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SwiftUI 布局协议 - Part2

: Subviews, cache: inout ()) -> CGSize { let maxSize = subviews.map { $0.sizeThatFits...placeSubviews(in: bounds, proposal: proposal, subviews: subviews[12.....: Subviews) -> Caches { Caches(topCache: hStack.makeCache(subviews: topViews(subviews: subviews...)), centerCache: vStack.makeCache(subviews: centerViews(subviews: subviews)),...bottomCache: hStack.makeCache(subviews: bottomViews(subviews: subviews))) } // ... } 插入两个布局

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九宫格常用的宏

和 WIDTH 不能都是 CGFloat */ #define CELL_X_WITH_SUPERVIEW_AND_WIDTH(SUPERVIEW,WIDTH,COLUMN) SUPERVIEW.subviews.count...% COLUMN * WIDTH + SUPERVIEW.subviews.count % COLUMN * MARGIN /** 设置格子的Y坐标 * SUPERVIEW 指九宫格每个小格子的父视图.../ COLUMN * HEIGHT + SUPERVIEW.subviews.count / COLUMN * MARGIN /**************************有间距、有边距**...% COLUMN * WIDTH + (SUPERVIEW.subviews.count % COLUMN + 1) * MARGIN /** 设置格子的Y坐标 * SUPERVIEW 指九宫格每个小格子的父视图.../ COLUMN * HEIGHT + (SUPERVIEW.subviews.count / COLUMN + 1) * MARGIN 九宫格demo地址

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SwiftUI 在 WWDC 24 之后的新变化

content: Content var body: some View { VStack { Group(subviewsOf: content) { subviews...subviews.isEmpty { subviews[0] }...if subviews.count > 1 { subviews[1] } }...if subviews.count > 2 { VStack { subviews[2...]

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iOS开发小点·移除所有子视图

需求: 移除所有子视图思路1 - OC的API [view.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)]...; 思路2 - 循环 for(UIView *view in [self.view subviews]){ [view removefromsuperview] } 思路3 - 枚举 [[self.view...subviews] enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {

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layoutSubviews解析

2.Lays out subviews文档解析。...在iOS5.1或之前的版本中,这个方法什么也没干.这个方法的默认实现是用参数来设定subviews的尺寸和位置的 ....Subclasses can override this method as needed to perform more precise layout of their subviews....You can use your implementation to set the frame rectangles of your subviews directly....如果你需要更加精确的布局,可以在子类里面重写这个方法.仅仅在以下情况下:自动布局达不到你想要效果时你才有必要重写这个方法.你可以直接设置subviews的尺寸.

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SwiftUI 布局 —— 尺寸（下）

: Subviews, cache: inout ()) -> CGSize { guard subviews.count == 2, let content = subviews.last else...) { guard subviews.count == 2, let background = subviews.first, let content = subviews.last else...: Subviews, cache: inout ()) -> CGSize { guard subviews.count == 1, let content = subviews.first...: Subviews, cache: inout ()) { guard subviews.count == 1, let content = subviews.first else {...: Subviews, cache: inout ()) -> CGSize { guard subviews.count == 2, let content = subviews.last else

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iOS获取网络的最新方法

int)dataNetworkTypeFromStatusBar { UIApplication app = [UIApplicationsharedApplication]; NSArray subviews...= [[[app valueForKey:@"statusBar"] valueForKey:@"foregroundView"] subviews]; NSNumber *dataNetworkItemView...= nil; for (id subview in subviews) { if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView

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绘制图形的视图方式为_三角函数图象的平移变换

A view can have subviews; If a view is removed from the interface, its subviews are removed; if a view...is hidden (made invisible), its subviews are hidden; if a view is moved, its subviews move with it;...and other changes in a view are likewise shared with its subviews....All other views in your main window will be subviews of the root view....This affects subviews: if a superview has an alpha of 0.5, none of its subviews can have an apparent

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iOS开发知识点

searchBarTextDidBeginEditing:(UISearchBar *)searchBar { _searchBarView.searchBar.showsCancelButton = YES; NSArray *subViews...deviceVersion = [UIDevice currentDevice].systemVersion.floatValue; if (deviceVersion >= 7.0) { subViews...= [_searchBarView.searchBar.subviews[0] subviews]; } else { subViews = _searchBarView.searchBar.subviews...; } for (id view in subViews) { if ([view isKindOfClass:[UIButton class]]) {

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iOS获取网络的最新方法

int)dataNetworkTypeFromStatusBar { UIApplication app = [UIApplicationsharedApplication]; NSArray subviews...= [[[app valueForKey:@"statusBar"] valueForKey:@"foregroundView"] subviews]; NSNumber *dataNetworkItemView...= nil; for (id subview in subviews) { if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView

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iOS开发之UIScrollView在Autolayout下的使用

一、使用的基本原则：原则1：UIScrollView的size依赖于subviews 首先在StoryBoard中拖入一个UIScrollView，用Pin按钮，随意设置其布局。...因为设置UIScrollView的布局约束是没有用的，UIScrollView的size（即contentSize）是根据其中的subviews所占据的size来计算的。...原则2：subviews的size不能依赖于UIScrollView 因为UIScrollView的size依赖于subviews，而如果subviews的size再依赖于UIScrollView，就类似于操作系统中的死锁了

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掌握 ViewThatFits

: Subviews, cache: inout Int?)...subviews.isEmpty else { return .zero } // 一个子视图，返回该子视图的需求尺寸 guard subviews.count > 1...else { cache = subviews.endIndex - 1 return subviews[subviews.endIndex - 1].sizeThatFits...(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout Int?)..._: Subviews) -> Int?

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iOS遍历打印所有子视图引实现结

实现其实实现起来很简单，用递归，我们通过 [UIView subviews] 方法就可以获取一个 view 的所有子view，对于每一个子view，我们又去递归调用这个方法看看他有没有子view，有就继续调用...就是一些更人性化的做法了，实现起来也很简单，直接看代码： // 递归获取子视图 - (void)getSub:(UIView *)view andLevel:(int)level { NSArray *subviews...= [view subviews]; // 如果没有子视图就直接返回 if ([subviews count] == 0) return; for (UIView...*subview in subviews) { // 根据层级决定前面空格个数，来缩进显示 NSString *blank = @"";

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iOS获取当前网络环境

// 获取网络环境的方法 + (NSString *)networktype{ NSArray *subviews = [[[[UIApplication sharedApplication]...valueForKey:@"statusBar"] valueForKey:@"foregroundView"]subviews]; NSNumber *dataNetworkItemView...= nil; for (id subview in subviews) { if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView

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自定义UISearchController的外观

同时我们也可以直接获取UISearchBar的subViews,UISearchBar的subView是一个UIView的实例，这个UIView包含了所有在UISearchBar上可以展示的子视图，iOS...我们可以通过循环遍历出UISearchBar上所有展示出来的子视图 for(UIView*viewin[[[_searchController.searchBar subviews]lastObject...]subviews] ) { if([viewisKindOfClass:NSClassFromString(@"UISearchBarBackground")]) {} if([viewisKindOfClass...searchController.searchBar setShowsCancelButton:YES animated:NO]; 去掉搜索框背景 for(UIView*viewin[[[_searchController.searchBar subviews...]lastObject]subviews] ) { if([viewisKindOfClass:NSClassFromString(@"UISearchBarBackground")]) { [view

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iOS 点击事件如何穿透透明的View?

首先调用当前视图的pointInside:withEvent:方法判断触摸点是否在当前视图内；若返回NO,则hitTest:withEvent:返回nil; 若返回YES,则向当前视图的所有子视图(subviews...)发送hitTest:withEvent:消息，所有子视图的遍历顺序是从top到bottom，即从subviews数组的末尾向前遍历,直到有子视图返回非空对象或者全部子视图遍历完毕；若第一次有子视图返回非空对象...point withEvent:event] == NO) {return nil;} // 3.从后往前遍历自己的子控件 NSInteger subViewCoutn = self.subviews.count...NSInteger i = subViewCoutn - 1; i >= 0; i--) { // 取subView UIView *childView = self.subviews

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两个宏快速计算九宫格X、Y坐标

和 WIDTH不能都是CGFloat */ #define CELL_X_WITH_EDGE_PARAMETERS(SUPERVIEW,WIDTH,COLUMN,MARGIN) SUPERVIEW.subviews.count...% COLUMN * WIDTH + (SUPERVIEW.subviews.count % COLUMN + 1) * MARGIN /** 设置格子的Y坐标 * SUPERVIEW 指九宫格每个小格子的父视图...HEIGHT不能都是CGFloat */ #define CELL_Y_WITH_EDGE_PARAMETERS(SUPERVIEW,HEIGHT,COLUMN,MARGIN) SUPERVIEW.subviews.count.../ COLUMN * HEIGHT + (SUPERVIEW.subviews.count / COLUMN + 1) * MARGIN 前提：使用这两个宏的前提是我们必须要把格子单独的放到一个父视图上...因为每个小格子X坐标、Y坐标的计算严格依赖于小格子所在的父视图的subViews的count。

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