拨打电话并在结束通话后返回app

#pragma mark - 懒加载
- (UIWebView *)callView{

    if (!_callView) {
        _callView = [[UIWebView alloc] init];
        [self addSubview:self.callView];
    }
    return _callView;
}

_labelOfNum.text是电话号码, self.callView继承于UIWebView, 使用时把self.callView创建并添加到父视图上即可

NSURL *telURL = [NSURL URLWithString:[NSString stringWithFormat:@"tel:%@", _labelOfNum.text]];
[self.callView loadRequest:[NSURLRequest requestWithURL:telURL]];