iOS13适配记录

1、模态跳转方式：presentViewController

问题如下图：

解决：跳转前，添加入下一句代码即可

vc.modalPresentationStyle = UIModalPresentationFullScreen;

别添加错位置了，是即将跳转的页面添加，不是self

例如：

IndicationViewController *vc = [[IndicationViewController alloc] init];
vc.modalPresentationStyle = UIModalPresentationFullScreen;
[self presentViewController:vc animated:YES completion:nil];

runtime优化presentViewController方式跳转：

1、把如下代码拷贝到项目之中即可全局解决，跳转使用之前样式
2、如果某个controller想使用新样式，则
vc.wg_setModalPresentationStyle = NO;

.h
#import 

NS_ASSUME_NONNULL_BEGIN

@interface UIViewController (WGPresent)

// 某个控制器想用系统默认,则设置NO
@property (nonatomic, assign) BOOL wg_setModalPresentationStyle;

@end

NS_ASSUME_NONNULL_END

.m
#import "UIViewController+WGPresent.h"
#import 

@implementation UIViewController (WGPresent)

+(void)load {
    
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        
        SEL oldSel = @selector(presentViewController:animated:completion:);
        SEL newSel = @selector(wg_presentViewController:animated:completion:);
        
        Method old = class_getInstanceMethod([self class], oldSel);
        Method new = class_getInstanceMethod([self class], newSel);
        if (class_addMethod([self class], oldSel, method_getImplementation(new), method_getTypeEncoding(new))) {
            
            class_replaceMethod([self class], newSel, method_getImplementation(old), method_getTypeEncoding(old));
        }else {
            
            method_exchangeImplementations(old, new);
        }
    });
}

- (void)wg_presentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion {
    
    if (@available(iOS 13.0, *)) {
        
        if (viewControllerToPresent.wg_setModalPresentationStyle) {
            
            viewControllerToPresent.modalPresentationStyle = UIModalPresentationFullScreen;
        }
    }
    [self wg_presentViewController:viewControllerToPresent animated:flag completion:completion];
}

- (BOOL)wg_setModalPresentationStyle {
    
    NSNumber *obj = objc_getAssociatedObject(self, @selector(wg_setModalPresentationStyle));
    return obj ? [obj boolValue] : [self.class wg_GlobalSetModalPresentationStyle];
}

-(void)setWg_setModalPresentationStyle:(BOOL)wg_setModalPresentationStyle {
    
    objc_setAssociatedObject(self, @selector(wg_setModalPresentationStyle), @(wg_setModalPresentationStyle), OBJC_ASSOCIATION_ASSIGN);
}

//以后迭代版本,想全部用系统之前样式(排除UIImagePickerController,UIAlertController)
+ (BOOL)wg_GlobalSetModalPresentationStyle {
    
    if ([self isKindOfClass:[UIImagePickerController class]] || [self isKindOfClass:[UIAlertController class]]) {
        
        return NO;
    }
    return YES;
}

@end

2、全局关闭暗黑模式

1、在Info.plist 文件中，添加UIUserInterfaceStyle key 名字为 User Interface Style 值为String。
2、将UIUserInterfaceStyle key 的值设置为 Light

3、单个界面不遵循暗黑模式

UIViewController与UIView 都新增一个属性 overrideUserInterfaceStyle，将 overrideUserInterfaceStyle 设置为对应的模式，则强制限制该元素与其子元素以设置的模式进行展示，不跟随系统模式改变进行改变

4、通过 KVC来修改一些没有暴露出来的属性，崩溃

[self.importCertificateNumTextFiled setValue:kGrayColor forKeyPath:@"_placeholderLabel.textColor"];

修改为

if (@available(iOS 13.0, *)) {
    self.importCertificateNumTextFiled.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"请输入" attributes:@{NSForegroundColorAttributeName : kGrayColor}];
}else{
    [self.importCertificateNumTextFiled setValue:kGrayColor forKeyPath:@"_placeholderLabel.textColor"];
}

5、适配Dark Mode

6、UITabBar title选中颜色被还原，出现问题

在设置UITabBar的地方添加如下代码

 [[UITabBar appearance] setUnselectedItemTintColor: UIColor.grayColor];

例如我的代码：

- (UINavigationController *)viewController:(UIViewController *)vc title:(NSString *)title nomalImg:(NSString *)imgStr tag:(NSInteger)tag{
    
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
    UITabBarItem *item = [[UITabBarItem alloc] initWithTitle:title image:[UIImage imageNamed:imgStr] tag:tag];
    item.selectedImage = [UIImage imageNamed:[NSString stringWithFormat:@"%@%@",imgStr,@"s"]];
    [item setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:UIColor.redColor, NSForegroundColorAttributeName, nil] forState:UIControlStateSelected];
    [[UITabBar appearance] setUnselectedItemTintColor:UIColor.grayColor];
    
    vc.tabBarItem = item;
    return nav;
}

参考：
iOS13 暗黑模式(Dark Mode)适配之OC版
iOS 13 问题解决以及苹果登录,暗黑模式
iOS13 DarkMode适配（一）