iOS_捕捉JSAlert/confirm事件

利用iOS原生代码为壳，加载Html代码的过程中，进行alert或者confirm进行信息提示的时候，会出现下图的情况：

这个时候，就需要捕捉alert或者confirm的事件，以便处理提示框显示的样式。

---

捕捉alert或者confirm的事件，代码如下：

@implementation UIWebView (JavaScriptAlert)

- (void)webView:(UIWebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(id)frame {
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"温馨提示" message:message preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *ensureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];
    [alertController addAction:ensureAction];

    UIViewController *rootViewController = [UIApplication sharedApplication].windows.firstObject.rootViewController;
    [rootViewController presentViewController:alertController animated:YES completion:nil];
}
static BOOL clickState = NO;
static NSInteger btnIndex = -1;
- (BOOL)webView:(UIWebView *)sender runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(id)frame {
    NSString *otherButtonText = @"确定";
    NSString *cancelButtonText = @"取消";
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"温馨提示" message:message preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelButtonText style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        [self clickActionButton:0];
    }];
    UIAlertAction *ensureAction = [UIAlertAction actionWithTitle:otherButtonText style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        [self clickActionButton:1];
    }];
    [alertController addAction:cancelAction];
    [alertController addAction:ensureAction];
    UIViewController *rootViewController = [UIApplication sharedApplication].windows.firstObject.rootViewController;
    [rootViewController presentViewController:alertController animated:YES completion:nil];
    btnIndex = -1;
    while (btnIndex == -1) {
        [[NSRunLoop mainRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.1f]];
    }
    if (btnIndex == 0){
        // 取消
        clickState = NO;
    }else if (btnIndex == 1) {
        // 确定
        clickState = YES;
    }
    return clickState;
}
- (void)clickActionButton:(NSInteger)buttonIndex{
    btnIndex = buttonIndex;
}


@end

经测试结果如图所示：

---

代码地址：
https://github.com/FlyingKuiKui/JSMutuallObjectC.git