引言

本文以​​pod 'PGDatePicker' ,'2.6.9'·​​为例子

I、iOS视图置顶方案

让一个View至于最顶端， 避免被其他子视图遮盖住


zPosition : 同级Layer改变显示顺序

bringSubviewToFront: 让指定子视图显示到窗口最前面



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II、案例：适配iOS12系统上日期视图被筛选视图遮挡问题

适配iOS12系统上日期视图被筛选视图遮挡问题

背景：为了适配iOS12系统上日期视图被筛选视图遮挡问题


iOS修改第三方库日期视图的层级来避免被其他视图遮挡(针对PGDatePicker进行iOS12的适配)_iOS


方案：修改第三方库日期视图的层级


修改PGDatePickManager，在viewWillLayoutSubviews将contentView和dismissView添加到keyWindow

由于是第三方SDK，可使用自定义类重写viewWillLayoutSubviews，但是推荐在分类使用方法交换进行实现


2.1 自定义类重写viewWillLayoutSubviews

- (void)viewWillLayoutSubviews {
    [super viewWillLayoutSubviews];

    self.headerView.style = self.style;
    self.dismissView.frame = self.view.bounds;
    self.contentView.backgroundColor = self.datePicker.backgroundColor;
    if (self.style == PGDatePickManagerStyleSheet) {
        [self setupStyleSheet];
    }else if (self.style == PGDatePickManagerStyleAlertTopButton) {
        [self setupStyleAlert];
    }else {
        [self setupStyle3];
    }
//    [self.view bringSubviewToFront:self.contentView];
    [[UIApplication sharedApplication].keyWindow addSubview:_dismissView];
    [[UIApplication sharedApplication].keyWindow addSubview:self.contentView];

}

2.2 在分类使用方法交换让日期视图视图置顶

.h

//PGDatePickManager+ios12.h
#import "PGDatePickManager.h"

NS_ASSUME_NONNULL_BEGIN

@interface PGDatePickManager (ios12)

@end

NS_ASSUME_NONNULL_END

.m

#import "PGDatePickManager+ios12.h"



@implementation PGDatePickManager (ios12)

+ (void)load {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{

        NSArray *selStringsArray = @[@"viewWillLayoutSubviews"];


        [selStringsArray enumerateObjectsUsingBlock:^(NSString *selString, NSUInteger idx, BOOL *stop) {
            NSString *mySelString = [@"sd_" stringByAppendingString:selString];

            Method originalMethod = class_getInstanceMethod(self, NSSelectorFromString(selString));
            Method myMethod = class_getInstanceMethod(self, NSSelectorFromString(mySelString));
            method_exchangeImplementations(originalMethod, myMethod);
        }];
    });
}
- (void)sd_viewWillLayoutSubviews{

    [self sd_viewWillLayoutSubviews];

        [UIApplication.sharedApplication.delegate.window bringSubviewToFront:self.view.superview];

}





@end

see also

公众号：iOS逆向