1、按钮的点击事件
（1）在Main.storyboard文件放一个button，右键Referencing Outlets 按住拉到ViewControler.m文件的接口中间

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIButton *main_btn;//自动生成的
@end

- (void)viewDidLoad {
    [super viewDidLoad];
    [_main_btn addTarget:self action:@selector(abc:) forControlEvents:UIControlEventTouchUpInside];
}

- (IBAction)abc:(id)sender {
    //点击内容
}

2、修改app图标
在项目里面点击Assets.xcassets的AppIcon 可以修改图标

3、动态修改状态字体颜色
（1）在Info.plist里面添加 View controller-based status bar appearance Boolean NO

  在ViewController里面任何地方配置都可以
   [UIApplication sharedApplication].statusBarStyle= UIStatusBarStyleLightContent; //状态栏白字
   [UIApplication sharedApplication].statusBarStyle= UIStatusBarStyleDefault;//状态栏黑字

4、IOSWkWebView加载网页，跨域问题，js交互
（1）在ViewController.h添加webview组件

#import <UIKit/UIKit.h>
#import <WebKit/WebKit.h>
@interface ViewController : UIViewController
{
    WKWebView *webView;
}

@end

（2）在ViewController.m初始化webview组件

#import <WebKit/WebKit.h>

- (void)viewDidLoad {
    [super viewDidLoad];

    WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];
    [configuration setValue:@YES forKey:@"_allowUniversalAccessFromFileURLs"];

    CGFloat width = self.view.frame.size.width;
    CGFloat height = self.view.frame.size.height - 20;   //2个20是由于要设配iphone版本 phoneX以上是44以下是20（好像，反正页面太高或太低就改这2个值，一定要一样）
    webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 20, width, height) configuration:configuration];
    
    [self setAutomaticallyAdjustsScrollViewInsets:NO];
    webView.navigationDelegate = self;

    [self.view addSubview: webView];
    NSURLRequest *request =[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]];
    [webView loadRequest:request];

    [[webView configuration].userContentController addScriptMessageHandler:self name:@"setBlackStateBar"];
    [[webView configuration].userContentController addScriptMessageHandler:self name:@"setWhiteStateBar"];
    [[webView configuration].userContentController addScriptMessageHandler:self name:@"share"];
}

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
 //有参数的时候的取值方法
//    NSMutableDictionary *params = [NSMutableDictionary dictionary];
//    NSString *title = [dic objectForKey:@"title"];
//    NSString *content = [dic objectForKey:@"content"];
//    NSString *url = [dic objectForKey:@"url"];
 //   NSString *imgUrl = [dic objectForKey:@"imgUrl"];
  
    if ([message.name isEqualToString:@"setBlackStateBar"]) {
        [UIApplication sharedApplication].statusBarStyle= UIStatusBarStyleDefault; //状态栏字体变黑色
    }else if([message.name isEqualToString:@"setWhiteStateBar"]){
        [UIApplication sharedApplication].statusBarStyle= UIStatusBarStyleLightContent;//状态栏字体变白色
    }else if([message.name isEqualToString:@"share"]){
       //动作
    }
}

JS调用

//无参数
window.webkit.messageHandlers.setWhiteStateBar.postMessage({}); 
//有参数
window.webkit.messageHandlers.share.postMessage({title:'标题',content:'测试分享的内容',url:'https://github.com/maying1992',imgUrl:'https://ss1.baidu.com/6ONXsjip0QIZ8tyhnq/it/u=3972947389,1417766871&fm=173&app=49&f=JPEG?w=500&h=306&s=5A024D88F2ED1EAEA2AD0DD7030050A2'})

保存UIImage并在图片列表中可以看到

  func loadImage(image:UIImage){
        UIImageWriteToSavedPhotosAlbum(image, self, #selector(self.image(image:didFinishSavingWithError:contextInfo:)), nil)
        
    }
    
    //回调
    @objc func image(image: UIImage, didFinishSavingWithError: NSError?,contextInfo: AnyObject)
    {
        if didFinishSavingWithError != nil
        {
            print("error!")
            return
        }
        
    }

Xcode 提示报错：Build operations are disabled: ‘Runner.xcworkspace’ has changed and is reloading.
重启Xcode

flutter ios 卡死在闪屏页：

1. flutter doctor

2. flutter clean

3. flutter build ios --release

libc++abi.dylib: terminating with uncaught exception of type NSException

SDK出现libc++abi.dylib: terminating with uncaught exception of type NSException 的问题: 解决方法

结合

监测bug(上线前需要处理掉)

pod 'AvoidCrash' pod 'Bugly'

快速定位问题页面

步骤1:工程文件中选择Build Setting，在"Other Linker Flags"中加入"-ObjC" ,问题就解决了,注意大小写
步骤2：使用字面量字典，如果元素中有nil值时，程序会崩溃，报异常。

xcode重复导包报错
Unexpected duplicate tasks:

1. Target 'image_pickers' (project 'Pods') has copy command from '/Users/dashanwangluo/Desktop/project/flutter/.pub-cache/hosted/pub.flutter-io.cn/image_pickers-1.0.7+3/ios/Classes/AKGallery/img/left_arrow.png' to '/Users/dashanwangluo/Library/Developer/Xcode/DerivedData/Runner-atzrkdnxehanrwgkqwyqhlvkrydh/Build/Intermediates.noindex/ArchiveIntermediates/Runner/IntermediateBuildFilesPath/UninstalledProducts/iphoneos/image_pickers.framework/left_arrow.png'
   解决方法：
   File->WorkSpace Setting

   
   image.png

设置软件盘中文
Localization native development region 的值改成 China