1、自定义window
2、转换坐标系
3、递归判断该控件是否在主窗口上显示
4、判断窗口的显示颜色
自定义window盖在状态栏上面, 之前遇到过报错，就是因为没有rootViewController, 后来写在dispatch_after就没事了
//
// BSTopWindow.m
// 百思不得姐
//
// Created by lxy on 16/6/6.
// Copyright © 2016年 lxy. All rights reserved.
//
#import "BSTopWindow.h"
@implementation BSTopWindow
// 全局变量
static UIWindow *_window;
// 隐藏
+ (void)hide {
_window.hidden = YES;
}
// 显示
+ (void)show {
// 这样写就没事
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.25 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
_window = [[UIWindow alloc] init];
_window.windowLevel = UIWindowLevelAlert;
_window.frame = [UIApplication sharedApplication].statusBarFrame;
_window.backgroundColor = [UIColor clearColor];
_window.hidden = NO;
[_window addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(topWindowClick)]];
});
}
/**
* 这里一定是个类方法,监听窗口点击
*/
+ (void)topWindowClick {
UIWindow *window = [UIApplication sharedApplication].keyWindow;
[self searchScrollViewInView:window];
}
// 递归查找, 判断是否在主窗口上
+ (void)searchScrollViewInView:(UIView *)superView {
for (UIScrollView *subview in superView.subviews) {
// 得到subView在窗口中的frame， nil就是主窗口， 意思就是说，subview.frame从subview.superview坐标系转换为窗口坐标系
CGRect newFrame = [subview.superview convertRect:subview.frame toView:[UIApplication sharedApplication].keyWindow];
// 或者这样写
// CGRect newFrame = [subview.superview convertRect:subview.frame toView:nil];
BOOL isShowingOnWindow = subview.window == [UIApplication sharedApplication].keyWindow && !subview.isHidden && subview.alpha > 0.01 && CGRectIntersectsRect(newFrame, winBounds);
// 如果是scrollView，滚动最顶部
if ([subview isKindOfClass:[UIScrollView class]] && isShowingOnWindow) {
CGPoint offset = subview.contentOffset;
offset.y = -subview.contentInset.top;
[subview setContentOffset:offset animated:YES];
}
// 继续查找子控件
[self searchScrollViewInView:subview];
}
}
@end
在其他控制器的viewDidAppear里面实现隐藏
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
[BSTopWindow hide];
}
返回界面记得显示出来
- (IBAction)backLogin {
[BSTopWindow show];
[self dismissViewControllerAnimated:YES completion:nil];
}
