我在主屏幕上有一个带有UITabBarController
的iOS应用程序,导航到隐藏UITabBarController
并设置hidesBottomBarWhenPushed = true
的详细屏幕。
当回到主屏幕时,UITabBarController
做了一个奇怪的“跳跃”,如这个GIF所示:
这仅在iOS 12.1上发生,而不是在12.0或11.x上发生。
看起来像iOS 12.1的错误,因为我注意到其他应用程序如FB Messenger有这种行为,但我想知道,是否有某种解决方法呢?
在你的UITabBarController
中,设置isTranslucent = false
这是快捷的代码
extension UIApplication {
open override var next: UIResponder? {
// Called before applicationDidFinishLaunching
SwizzlingHelper.enableInjection()
return super.next
}
}
class SwizzlingHelper {
static func enableInjection() {
DispatchQueue.once(token: "com.SwizzlingInjection") {
//what to need inject
UITabbarButtonInjection.inject()
}
我面临着完全相同的问题,即应用程序的每个选项卡都有一个导航控制器。我发现解决这个问题的最容易的非hacky方法是将UITabBarController
放在UINavigationController
中,并移除单个UINavigationController
s。
之前:
-> UINavigationController -> UIViewController
-> UINavigationController -> UIViewController
UITabBarController -> UINavigationController -> UIViewController
-> UINavigationController -> UIViewController
-> UINavigationController -> UIViewController
后:
-> UIViewController
-> UIViewController
UINavigationController -> UITabBarController -> UIViewController
-> UIViewController
-> UIViewController
通过使用外部UINavigationController
,您无需在将视图控制器推入导航堆栈时隐藏UITabBar
。
警告:
到目前为止我发现的唯一问题是,在每个UIViewController
上设置标题或右/左栏按钮项目的效果不同。为了克服这个问题,当可见的UITabBarControllerDelegate
发生变化时,我通过UIViewController
应用了这些变化。
func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
guard let topItem = self.navigationController?.navigationBar.topItem else { return }
precondition(self.navigationController == viewController.navigationController, "Navigation controllers do not match. The following changes might result in unexpected behaviour.")
topItem.title = viewController.title
topItem.titleView = viewController.navigationItem.titleView
topItem.leftBarButtonItem = viewController.navigationItem.leftBarButtonItem
topItem.rightBarButtonItem = viewController.navigationItem.rightBarButtonItem
}
请注意,我已经添加了一个preconditionFailure
来捕捉导航架构修改后的任何情况
如果你仍然希望保持标签栏半透明,你需要从UITabBar
子类并覆盖属性safeAreaInsets
class MyTabBar: UITabBar {
private var safeInsets = UIEdgeInsets.zero
@available(iOS 11.0, *)
override var safeAreaInsets: UIEdgeInsets {
set {
if newValue != UIEdgeInsets.zero {
safeInsets = newValue
}
}
get {
return safeInsets
}
}
}
这个想法是不允许系统设置zero
插件,因此标签栏不会跳转。
Apple已经在iOS 12.1.1中修复了这个问题
我想这是Apple的错误但是你可以尝试这个作为一个热门修复:只需为你的tabBar创建一个类,其代码如下:
import UIKit
class FixedTabBar: UITabBar {
var itemFrames = [CGRect]()
var tabBarItems = [UIView]()
override func layoutSubviews() {
super.layoutSubviews()
if itemFrames.isEmpty, let UITabBarButtonClass = NSClassFromString("UITabBarButton") as? NSObject.Type {
tabBarItems = subviews.filter({$0.isKind(of: UITabBarButtonClass)})
tabBarItems.forEach({itemFrames.append($0.frame)})
}
if !itemFrames.isEmpty, !tabBarItems.isEmpty, itemFrames.count == items?.count {
tabBarItems.enumerated().forEach({$0.element.frame = itemFrames[$0.offset]})
}
}
}
这是一个可以处理旋转和添加或删除标签栏项目的解决方案:
class FixedTabBar: UITabBar {
var buttonFrames: [CGRect] = []
var size: CGSize = .zero
override func layoutSubviews() {
super.layoutSubviews()
if UIDevice.current.systemVersion >= "12.1" {
let buttons = subviews.filter {
String(describing: type(of: $0)).hasSuffix("Button")
}
if buttonFrames.count == buttons.count, size == bounds.size {
zip(buttons, buttonFrames).forEach { $0.0.frame = $0.1 }
} else {
buttonFrames = buttons.map { $0.frame }
size = bounds.size
}
}
}
}
在我的情况下(iOS 12.1.4),我发现这种奇怪的毛刺行为是由与.modalPresentationStyle = .fullScreen
一起呈现的模态触发的
在将他们的presentationStyle更新为.overFullScreen
后,故障就消失了。
import UIKit
extension UITabBar{
open override func layoutSubviews() {
super.layoutSubviews()
if let UITabBarButtonClass = NSClassFromString("UITabBarButton") as? NSObject.Type{
let subItems = self.subviews.filter({return $0.isKind(of: UITabBarButtonClass)})
if subItems.count > 0{
let tmpWidth = UIScreen.main.bounds.width / CGFloat(subItems.count)
for (index,item) in subItems.enumerated(){
item.frame = CGRect(x: CGFloat(index) * tmpWidth, y: 0, width: tmpWidth, height: item.bounds.height)
}
}
}
}
open override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
if let view:UITabBar = super.hitTest(point, with: event) as? UITabBar{
for item in view.subviews{
if point.x >= item.frame.origin.x && point.x <= item.frame.origin.x + item.frame.size.width{
return item
}
}
}
return super.hitTest(point, with: event)
}
}
有两种方法可以解决这个问题,首先,在你的UITabBarController中,设置isTranslucent = false,如:
[[UITabBar appearance] setTranslucent:NO];
其次,如果第一个解决方案没有修复您的问题,请尝试这种方式:
这是Objective-C代码
// .h
@interface CYLTabBar : UITabBar
@end
// .m
#import "CYLTabBar.h"
CG_INLINE BOOL
OverrideImplementation(Class targetClass, SEL targetSelector, id (^implementationBlock)(Class originClass, SEL originCMD, IMP originIMP)) {
Method originMethod = class_getInstanceMethod(targetClass, targetSelector);
if (!originMethod) {
return NO;
}
IMP originIMP = method_getImplementation(originMethod);
method_setImplementation(originMethod, imp_implementationWithBlock(implementationBlock(targetClass, targetSelector, originIMP)));
return YES;
}
@implementation CYLTabBar
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
if (@available(iOS 12.1, *)) {
OverrideImplementation(NSClassFromString(@"UITabBarButton"), @selector(setFrame:), ^id(__unsafe_unretained Class originClass, SEL originCMD, IMP originIMP) {
return ^(UIView *selfObject, CGRect firstArgv) {
if ([selfObject isKindOfClass:originClass]) {
if (!CGRectIsEmpty(selfObject.frame) && CGRectIsEmpty(firstArgv)) {
return;
}
}
// call super
void (*originSelectorIMP)(id, SEL, CGRect);
originSelectorIMP = (void (*)(id, SEL, CGRect))originIMP;
originSelectorIMP(selfObject, originCMD, firstArgv);
};
});
}
});
}
@end
更多信息:https://github.com/ChenYilong/CYLTabBarController/commit/2c741c8bffd47763ad2fca198202946a2a63c4fc
您可以使用以下方法覆盖几个iOS 12颠倒的- (UIEdgeInsets)safeAreaInsets
方法:
- (UIEdgeInsets)safeAreaInsets {
UIEdgeInsets insets = [super safeAreaInsets];
CGFloat h = CGRectGetHeight(self.frame);
if (insets.bottom >= h) {
insets.bottom = [self.window safeAreaInsets].bottom;
}
return insets;
}
感谢@ElonChan的想法,我只是将c内联函数更改为OC静态方法,因为我不会太多使用这个overrideImplementation
。此外,此片段现已调整为iPhoneX。
static CGFloat const kIPhoneXTabbarButtonErrorHeight = 33;
static CGFloat const kIPhoneXTabbarButtonHeight = 48;
@implementation FixedTabBar
typedef void(^NewTabBarButtonFrameSetter)(UIView *, CGRect);
typedef NewTabBarButtonFrameSetter (^ImpBlock)(Class originClass, SEL originCMD, IMP originIMP);
+ (BOOL)overrideImplementationWithTargetClass:(Class)targetClass targetSelector:(SEL)targetSelector implementBlock:(ImpBlock)implementationBlock {
Method originMethod = class_getInstanceMethod(targetClass, targetSelector);
if (!originMethod) {
return NO;
}
IMP originIMP = method_getImplementation(originMethod);
method_setImplementation(originMethod, imp_implementationWithBlock(implementationBlock(targetClass, targetSelector, originIMP)));
return YES;
}
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
if (@available(iOS 12.1, *)) {
[self overrideImplementationWithTargetClass:NSClassFromString(@"UITabBarButton")
targetSelector:@selector(setFrame:)
implementBlock:^NewTabBarButtonFrameSetter(__unsafe_unretained Class originClass, SEL originCMD, IMP originIMP) {
return ^(UIView *selfObject, CGRect firstArgv) {
if ([selfObject isKindOfClass:originClass]) {
if (!CGRectIsEmpty(selfObject.frame) && CGRectIsEmpty(firstArgv)) {
return;
}
if (firstArgv.size.height == kIPhoneXTabbarButtonErrorHeight) {
firstArgv.size.height = kIPhoneXTabbarButtonHeight;
}
}
void (*originSelectorIMP)(id, SEL, CGRect);
originSelectorIMP = (void (*)(id, SEL, CGRect))originIMP;
originSelectorIMP(selfObject, originCMD, firstArgv);
};
}];
}
});
}
@end