OC常用

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iOS14获取idfa

1,添加系统库:AppTrackingTransparency.framework
2,Xcode工程中Info.plist权限配置: 

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Privacy - Tracking Usage Description  : 需要你允许使用广告标识符,以便追踪广告信息和推送.  
或
NSUserTrackingUsageDescription : 需要你允许使用广告标识符,以便追踪广告信息和推送.

3,头文件和代码

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#if defined(__IPHONE_14_0)
#import <AppTrackingTransparency/AppTrackingTransparency.h>//适配iOS14
#endif

/*
关于权限弹窗:每一个不同包名的APP只会在首次安装时弹出,无论是否允许追踪,下次要允许时,需要去(设置-隐私-允许隐私跟踪)进行设置;
测试时,需要每次换不同的包名进行测试.  
*/
if (@available(iOS 14, *)) {
    //调用该段代码时,会有权限弹窗弹出.
    [ATTrackingManager requestTrackingAuthorizationWithCompletionHandler:^(ATTrackingManagerAuthorizationStatus status) {
      NSLog(@"Status: %lu", (unsigned long)status);
        if (status == ATTrackingManagerAuthorizationStatusAuthorized) {
            NSLog(@"用户允许");
            NSString *idfa = [[ASIdentifierManager sharedManager].advertisingIdentifier UUIDString];
        }else{
            NSLog(@"用户不允许");
        }
    }];
    
} else {
    NSLog(@"OS14下的idfa");
    NSString *idfa = [[ASIdentifierManager sharedManager].advertisingIdentifier UUIDString];
}

iOS14以下的系统直接即可获取到idfa,不需要权限控制.

Xcode自动配置证书出现”XXXX has conflicting provisioning settings”

手动导入证书和自动管理的证书导致的冲突

“XXXX is automatically signed,but provisioning profile 45551591-2d82-4cc3-a2b7-99838c6700b3 has been manually specified. Set the provisioning profile value to “Automatic” in the build settings editor,or switch to manual signing in the project editor.”

解决方法:打开project.pbxproj文件,查找45551591-2d82-4cc3-a2b7-99838c6700b3并删除即可

Mac电脑显示隐藏文件

(commond + shift + . ) 按一次则是显示,再按一次则是隐藏

Xcode12后出现静态库 linked library ‘libPods-xxx.a‘ is missing one or more architectures required by this target: armv7

能正常真机测试，但build的时候会失败（红色警告）
升级xcode12后，项目在run debug时候是正常运行的，但是在build或者run release的时候就会出现如标题的红色错误。
在Target-Build Settings-Excluded Architectures中添加以下代码 

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EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_simulator__NATIVE_ARCH_64_BIT_x86_64=arm64 arm64e armv7 armv7s armv6 armv8 EXCLUDED_ARCHS=$(inherited) $(EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_$(EFFECTIVE_PLATFORM_SUFFIX)__NATIVE_ARCH_64_BIT_$(NATIVE_ARCH_64_BIT))

真机测试包Payload

出一个支持真机安装的xxx.ipa包
1,在xcode工程中,安装支持准备安装设备的证书和描述文件;
2,xcode中选择真机,Build工程,在Products文件中找到后缀为xxx.app文件
3,show in finder,copy一下xxx.app格式的文件;
4,在桌面创建名为Payload的文件夹,把xxx.app复制进去;
5,压缩Payload文件夹为Payload.zip
6,把Payload.zip修改为Payload.ipa,这个时候就是可以进行安装的ipa包了.
最后,可以使用xcode工具或者iTools进行安装ipa包;

书写block时

判断block为非空时,再进行赋值;

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if (self.block) {
    self.block(viewImage,str,location2D);
}

Errors were encountered while preparing your device for development. Please check the Devices and Simulators Window.

方法:
1,重启手机
2,还不行的话,在手机设置中 Developer-》clear Trusted computers,重新设置信任电脑试试

Github

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GitHub Desktop 使用
1,创建repository:选择本地某个文件夹作为一个repository,称为r1,然后push到自己GitHub账号上面;
2,修改:本地r1的文件,修改完之后,在GitHub Desktop把最新版本推送到GitHub;
3,回滚版本,在GitHub Desktop History选择某个版本,回滚的时候修改的是r1里面的文件
  GitHub没有修改,需要commit->Fetch origin;
4,注意,不要去修改GitHub上面repository工程文件;

5,⌘⇧.(Command + Shift + .)来查看当前文件夹是否有其他管理的.git,把他删除,不然无法添加到GitHub.

-[NSBundle initWithURL:]: nil URL argument’

某个资源包.bundle没有导入到工程中

向工程中添加第三方字体

1,把字体添加到Xcode中形如:A-OTF-FOLKPRO-MEDIUM.OTF 的文件
2,在Info.plist配置:

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//一个数组,Fonts provided by application
<key>UIAppFonts</key>
<array>
	<string>A-OTF-FOLKPRO-MEDIUM.OTF</string>
</array>

//使用, [UIFont familyNames]获取当前工程中存在的字体字段
if ([[UIFont familyNames] containsObject:@"A-OTF Folk Pro"]) {
    NSLog(@"导入字体成功");
}else{
    NSLog(@"导入字体失败");
}

SF Symbols中的图标

iOS13以后可以使用:UIImage *image = [UIImage systemImageNamed:@”mic”];
默认图标颜色是蓝色,修改颜色

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UIImage *image = [UIImage systemImageNamed:@"mic"];
UIImageView *showImage = [[UIImageView alloc]init];
showImage.frame = CGRectMake(100, 200, 20, 20);
showImage.image = image;
showImage.tintColor = [UIColor blackColor];//设置SF展示图片颜色
showImage.backgroundColor = [UIColor whiteColor];
[self.view addSubview:showImage];

xcode导出设备crash日志

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//设备能在xcode上安装app,才能正确导出日志

跳转App store 对应的app

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//形如
https://itunes.apple.com/app/apple-store/idxxxxxxxx?mt=8
//例如百度
https://itunes.apple.com/app/apple-store/id452186370?mt=8

关于读取bundle资源中的图片

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//bundle资源中保存不同的@2x,@3x等,使用如下方法会自动读取是使用2x还是3x
NSString *path= [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"GolfBundle.bundle/dz16.png"];//会自动识别bundle中@2x,@3x图片

获取当前加载图片的像素px

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CGFloat w = CGImageGetWidth(i2.CGImage);
CGFloat h = CGImageGetHeight(i2.CGImage);
//i2是UIImage实例对象

设置导航栏颜色和title字体

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//AppDelegate.m中
[[UINavigationBar appearance] setBarTintColor:[UIColor greenColor]];
[[UINavigationBar appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor blueColor]}];
//在对应的ViewController中,修改之后,所有的导航栏都会被改变.
self.navigationController.navigationBar.barTintColor = [UIColor greenColor];
self.navigationController.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName:[UIColor blueColor]};

iOS13处理通知token值

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//获取DeviceToken成功
- (void)application:(UIApplication *)application
didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
    //Xcode11打的包，iOS13获取Token有变化
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 13) {
        if (![deviceToken isKindOfClass:[NSData class]]) {
            //记录获取token失败的描述
            return;
        }
        const unsigned *tokenBytes = (const unsigned *)[deviceToken bytes];
        NSString *strToken = [NSString stringWithFormat:@"%08x%08x%08x%08x%08x%08x%08x%08x",
                              ntohl(tokenBytes[0]), ntohl(tokenBytes[1]), ntohl(tokenBytes[2]),
                              ntohl(tokenBytes[3]), ntohl(tokenBytes[4]), ntohl(tokenBytes[5]),
                              ntohl(tokenBytes[6]), ntohl(tokenBytes[7])];
        NSLog(@"deviceToken1:%@", strToken);
        return;
    } else {
        NSString *token = [NSString
                       stringWithFormat:@"%@",deviceToken];
        token = [token stringByReplacingOccurrencesOfString:@"<" withString:@""];
        token = [token stringByReplacingOccurrencesOfString:@">" withString:@""];
        token = [token stringByReplacingOccurrencesOfString:@" " withString:@""];
        NSLog(@"deviceToken2 is: %@", token);
    }
}

字符串和数组,字典之间的相互转换

NSData作为中间键

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//字典或者数组转字符串  
NSData * newOne = [myString dataUsingEncoding:NSUTF8StringEncoding];  
id content = [NSJSONSerialization JSONObjectWithData:newOne options:NSJSONReadingMutableContainers error:nil];  
//字符串(本身原来是字典或者是数组)转字典或者数组  
NSData * jsonData = [NSJSONSerialization dataWithJSONObject:myObject options:NSJSONWritingPrettyPrinted error:nil];
NSString * string = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];

比较稳定判断iPhoneX全面屏系列

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/// 是否是iPhoneX全面屏系列
FOUNDATION_STATIC_INLINE BOOL MYPhoneX(){
    BOOL IS_iPhone = ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone);//是iPhone不是iPad
    BOOL IS_iOS11 = ([[[UIDevice currentDevice] systemVersion] floatValue] >= 11.f);//全面屏iOS11以上才有
    BOOL iPhoneX = (IS_iOS11 && IS_iPhone && (MIN([UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height) >= 375 && MAX([UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height) >= 812));//后面min和max是判断横竖屏宽和高
    return iPhoneX;
}

设置CGSize常量值

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.h
CG_EXTERN  CGSize const MySize;
.m
CGSize const MySize = {3.0,2.0};

pod用法示例

cd 工程目录
vim Podfile
按esc退出编辑
:wq 保存
pod install 

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source 'https://github.com/CocoaPods/Specs.git'#turk
platform:ios, '10.0' #最低版本
inhibit_all_warnings! #忽略第三方警告
target 'xxx' do #target对应的名称
pod 'xxxxx', '~> 1.1.1' #第三方库名称
end

卡在pod install xxx

使用: pod install –verbose –no-repo-update 命令

truk报错

终端执行命令:pod repo remove trunk

UITableView部分设置

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//去掉cell之间的下划线
self.menuTableView.separatorStyle = UITableViewCellSeparatorStyleNone;

String

URL包含中文时候必要的转码

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//编码
NSString *charactersToEscape = @"?!@#$^&%*+,:;='\"`<>()[]{}/\\| ";
NSCharacterSet *allowedCharacters = [[NSCharacterSet characterSetWithCharactersInString:charactersToEscape] invertedSet];
NSString *encodedUrl = [aes stringByAddingPercentEncodingWithAllowedCharacters:allowedCharacters];  

NSString *new = [encodedUrl stringByRemovingPercentEncoding];//解码

横竖屏判断

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UIInterfaceOrientation currentOrientation = [[UIApplication sharedApplication] statusBarOrientation];
if(UIInterfaceOrientationIsPortrait(currentOrientation) == YES){
    NSLog(@"当前为竖屏1");
}else{
    NSLog(@"横屏");
}

Find(Regular Expression)查找xcode中所有中文:

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@"[^"]*[\u4E00-\u9FA5]+[^"\n]*?"

前往xcode证书路径

~/Library/MobileDevice/Provisioning Profiles

UIButton文字靠左

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forgetBtn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
forgetBtn.titleEdgeInsets = UIEdgeInsetsMake(0,0, 0, 0);

UITextFiled 左边留出空隙

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UIView * viewLeft1 = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 5, 5)];
filed.leftView = viewLeft1;
filed.leftViewMode = UITextFieldViewModeAlways;

设置父视图透明度,不改变子视图透明度

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在父视图上设置:  
self.view.backgroundColor=[[UIColor blackColor]colorWithAlphaComponent:0.5];

UITextFiled 首字母不大写

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[filed setAutocapitalizationType:UITextAutocapitalizationTypeNone];

重签名教程地址

设置WKWebView 背景色

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[self.myWebView setOpaque:NO];
self.myWebView.backgroundColor = [UIColor blackColor];

代码块声明 <#state#>

iPhone X 相关1

顶部:44(导航栏)-44(状态栏+圆弧部分);
底部:49(导航栏)-34(圆弧部分);

iOS13 vc present方式改回之前

naVC.modalPresentationStyle = UIModalPresentationFullScreen;
naVC被推出来的vc

默认选中某个cell

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//默认选中某个cell
NSIndexPath *selectIndex = [NSIndexPath indexPathForRow:0 inSection:0];
[_leftTableView selectRowAtIndexPath:selectIndex animated:YES scrollPosition:UITableViewScrollPositionNone];

判断是否是iphoneX(刘海),不算精准.

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UIKIT_STATIC_INLINE BOOL FDIS_IPHONEX(){
    BOOL isPhoneX = NO;
    if (@available(iOS 11.0, *)) {
        isPhoneX = [[UIApplication sharedApplication] delegate].window.safeAreaInsets.bottom > 0.0;
    }
    return isPhoneX;
}

UINavigationController 导航栏下坐标从(0,0)开始

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//iOS7之后默认全屏布局,也就说(0,0)是从左上角开始的,有导航栏的时候,可以在VC中设置如下
self.edgesForExtendedLayout = UIRectEdgeNone;

自定义返回按钮

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self.leftBackButton = [UIButton buttonWithType:UIButtonTypeCustom];
[self.leftBackButton addTarget:self action:@selector(hideAction) forControlEvents:UIControlEventTouchDown];
[self.leftBackButton setImage:[UIImage imageNamed:@"back.png"] forState:UIControlStateNormal];
UIBarButtonItem *item = [[UIBarButtonItem alloc]initWithCustomView:self.leftBackButton];
self.navigationItem.leftBarButtonItem = item;

关闭暗黑模式的适配

全局关闭暗黑模式:
在Info.plist文件中,添加key为User Interface Style,类型为String,value设置为Light即可. 

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//source code 模式下是
<key>UIUserInterfaceStyle</key>
<string>Dark</string>

单页面关闭暗黑模式:
单个页面或视图关闭暗黑模式，设置 overrideUserInterfaceStyle 为对应的模式，强制限制该视图与其子视图以设置的模式进行展示，不跟随系统模式改变进行改变. 

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self.overrideUserInterfaceStyle = UIUserInterfaceStyleLight;

设置此属性会影响当前view/viewController/window 以及它下面的任何内容。

iOS13创建工程:SceneDelegagte

iOS13 创建工程多了类:SceneDelegate(iPadOS多窗口支持)

打开本地文件地址测试

判断机型:iPad,iPhone…

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//判断是iPad:UIUserInterfaceIdiom(枚举类型)
[[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad

xcode 代码修改不生效

方案

respondsToSelector 返回一个布尔值,判断某个对象是否响应某个方法,防止异常.

—-分割线—

hexo常用命令

hexo n
hexo g 提交
hexo s 静态预览
hexo d 发布

hexo说明官网

判断苹果当前手机机型(如:iPhone7)

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//代码  
#import <sys/utsname.h>
struct utsname systemInfo;
uname(&systemInfo);
NSString * platform = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
NSLog(@"platform = %@",platform);

SF smybols下载路径

简单说明:SF是苹果iOS13之后本身自带的图片

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//实例,通过SF找到对应的图片名字即可
[UIImage systemImageNamed:@"lock.fill"];
//图片颜色设置
self.leftImageView.tintColor = [UIColor whiteColor];
//weights and scales,配置图片的大小和重量
UIImageSymbolConfiguration *con  = [UIImageSymbolConfiguration configurationWithPointSize:1 weight:UIImageSymbolWeightLight scale:UIImageSymbolScaleMedium];
[self.leftImageView.image imageByApplyingSymbolConfiguration:con];

GO下载主页

go教学

crash:[NSNull length]:unrecognized selector sent to instance

json数据中存在字符串,name = @”“这样的值
使用:isKindOfClass:[NSNull class]]来进行判断

提问:同步+主队列是否一定会造成死锁?

答案:不一定

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//1,在主线程中执行该段代码会造成死锁
dispatch_sync(mainQueue, ^{
    NSLog(@"不会崩溃");
});
//2,在子线程中执行该段代码不会造成死锁,concurrent1是并发队列
dispatch_async(concurrent1, ^{
    dispatch_sync(mainQueue, ^{
        NSLog(@"不会崩溃");
    });
});