在 iOS 11 使用 webview 發現頂部會有一個空白條，怎么也去不掉，通過設置 contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever 就可以解決了，具體的代碼如下：

// // ViewController.m // webView // // Created by exchen on 18/7/14. // Copyright ? 2018年 exchen. All rights reserved. //#import "ViewController.h"@interface ViewController () <UIWebViewDelegate>@property(nonatomic, strong) UIWebView* webView; @end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.CGRect screen = [[UIScreen mainScreen] bounds];//添加 UIWebViewself.webView = [[UIWebView alloc] initWithFrame: CGRectMake(0, 0, screen.size.width, screen.size.height)];[self.view addSubview: self.webView];NSURL * url = [NSURL URLWithString: @"https://www.exchen.net"];NSURLRequest * request = [NSURLRequest requestWithURL:url];[self.webView loadRequest:request];self.webView.delegate = self;//解決 iOS 11 屏幕頂部顯示不全if ([[UIDevice currentDevice].systemVersion floatValue] >= 11.0) {self.webView.scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;}}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated. }- (void)webViewDidStartLoad:(UIWebView *)webView {NSLog(@"%@",NSStringFromSelector(_cmd)); }//加載失敗時調用 - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {NSLog(@"%@",NSStringFromSelector(_cmd));NSLog(@"error: %@",error);UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"信息" message:@"連接服務器失敗，請檢查網絡" preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action){exit(0);}];[alertController addAction:cancelAction];[self presentViewController:alertController animated:YES completion:nil]; }- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{return true; }@end

原文地址：https://www.exchen.net/%E8%A7%A3%E5%86%B3-ios-11-webview-%E9%A1%B6%E9%83%A8%E7%A9%BA%E7%99%BD%E6%9D%A1%E7%9A%84%E9%97%AE%E9%A2%98.html

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