UIAlertController添加点击空白dismiss手势

UIAlertController+HLTapDismiss.m

#import "UIAlertController+JHTapDismiss.h"

@interface UIAlertController ()<UIGestureRecognizerDelegate>

@end

@implementation UIAlertController (JHTapDismiss)

- (void)alertTapDismiss {
    
    NSArray * arrayViews = [UIApplication sharedApplication].keyWindow.subviews;
    if (arrayViews.count>0) {
        //array会有两个对象，一个是UILayoutContainerView，另外一个是UITransitionView，我们找到最后一个
        UIView * backView = arrayViews.lastObject;

        backView.userInteractionEnabled = YES;
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap)];
        tap.delegate = self;
        [backView addGestureRecognizer:tap];
    }
    
}

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

#pragma mark - UIGestureRecognizerDelegate
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    
    UIView *tapView = gestureRecognizer.view;
    CGPoint point = [touch locationInView:tapView];
    CGPoint conPoint = [self.view convertPoint:point fromView:tapView];
    BOOL isContains = CGRectContainsPoint(self.view.bounds, conPoint);
    if (isContains) {
        // tap点在弹出框内 不响应tap手势事件
        return NO;
    }
    return YES;
}

@end