iOS UIAlertController點(diǎn)擊空白處消失

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface UIAlertController (TapGesAlertController)

- (void)tapGesAlert;

@end

#import "UIAlertController+TapGesAlertController.h"

@implementation UIAlertController (TapGesAlertController)

- (void)tapGesAlert{
    
  NSArray * arrayViews = [UIApplication sharedApplication].keyWindow.subviews;
    if (arrayViews.count>0) {
        //array會(huì)有兩個(gè)對(duì)象,一個(gè)是UILayoutContainerView,另外一個(gè)是UITransitionView,我們找到最后一個(gè)
        UIView * backView = arrayViews.lastObject;
        backView.userInteractionEnabled = YES;
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap)];
        [backView addGestureRecognizer:tap];
    }

}


-(void)tap
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

@end
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