webView、scrollView、TableView，为了防止滚动时出现偏移，底部黑框问题等

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if ([self respondsToSelector:@selector(automaticallyAdjustsScrollViewInsets)]) {self.automaticallyAdjustsScrollViewInsets = NO;}

或者：_webView.opaque =NO;

具体场景如下：

- (void)viewDidLoad {

    self.title = @"菜品详情页";

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor whiteColor];

    //加载web页面

    [self addWebViewDemo];

}

-(void)addWebViewDemo{

    _webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 64, JYEScreenWidth, JYEScreenHeight-64)];

    NSURL *url = [[NSURL alloc]initWithString:@"http://www.baidu.com"];

    NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url];

    [_webView loadRequest:request];

    //if ([self respondsToSelector:@selector(automaticallyAdjustsScrollViewInsets)]) {self.automaticallyAdjustsScrollViewInsets = NO;}

    _webView.opaque =NO;

    _webView.scalesPageToFit = YES;

    [self.view addSubview:_webView];

}

webView、scrollView、TableView，为了防止滚动时出现偏移，底部黑框问题等

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原文地址：http://www.cnblogs.com/lrr0618/p/5203667.html