小编Tuy*_*yen的帖子

有没有办法强制NSMutableArray只保存一个特定的对象类型？

我有类定义如下:

@interface Wheel:NSObject  
{    
  int size;  
  float diameter;  
}  
@end  


@interface Car:NSObject  
{  
   NSString *model;  
   NSString *make;  
   NSMutableArray *wheels;  
}  
@end

如何强制车轮阵列仅使用代码保存Wheel对象？(绝对不是其他物体)

自从我开始学习iOS开发以来,我已经看到了几种不同类型的崩溃日志.

我知道: 异常类型:EXC_BAD_ACCESS(SIGSEGV)意味着我们正在访问一个已发布的对象.

但不知道:
异常类型:EXC_BAD_ACCESS(SIGBUS)
异常类型:EXC_CRASH(SIGABRT)
异常类型:EXC_BREAKPOINT(SIGTRAP)

你知道iOS崩溃日志中有多少异常类型,它们是什么意思？

我正在从Xcode 3.5迁移到Xcode 4,而我正在尝试存档我的应​​用程序以进行AdHoc分发.
我收到了这个错误

预编译MyApp_Prefix.pch

ProcessPCH /Users/return/Library/Developer/Xcode/DerivedData/MyApp-cwtxjgdpsvtoyxcfpytllmzaxceb/Build/PrecompiledHeaders/MyApp_Prefix-crxrbmeralwexyefvuwvzexquuin/MyApp_Prefix.pch.pth MyApp_Prefix.pch normal armv7 objective-c com.apple.compilers.llvm.clang.1_0.compiler
cd /Users/return/Projects/iphone-MyApp
setenv LANG en_US.US-ASCII
setenv PATH "/Xcode4.2/Platforms/iPhoneOS.platform/Developer/usr/bin:/Xcode4.2/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Xcode4.2/Platforms/iPhoneOS.platform/Developer/usr/bin/clang -x objective-c-header -arch armv7 -fmessage-length=0 -fdiagnostics-print-source-range-info -fdiagnostics-show-category=id -fdiagnostics-parseable-fixits -std=c99 -Wno-trigraphs -fpascal-strings -O0 -Wreturn-type -Wparentheses -Wswitch -Wno-unused-parameter -Wunused-variable -Wunused-value -Wno-shorten-64-to-32 -DFAVOURITES_ENABLED=0 -isysroot /Xcode4.2/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk -gdwarf-2 -fvisibility=hidden -Wno-sign-conversion -mthumb "-DIBOutlet=__attribute__((iboutlet))" "-DIBOutletCollection(ClassName)=__attribute__((iboutletcollection(ClassName)))" "-DIBAction=void)__attribute__((ibaction)" -miphoneos-version-min=3.0 -iquote "/Users/return/Library/Developer/Xcode/DerivedData/MyApp-cwtxjgdpsvtoyxcfpytllmzaxceb/ArchiveIntermediates/MyApp - Distribution/IntermediateBuildFilesPath/MyApp.build/Distribution-iphoneos/MyApp.build/MyApp-generated-files.hmap" "-I/Users/return/Library/Developer/Xcode/DerivedData/MyApp-cwtxjgdpsvtoyxcfpytllmzaxceb/ArchiveIntermediates/MyApp - Distribution/IntermediateBuildFilesPath/MyApp.build/Distribution-iphoneos/MyApp.build/MyApp-own-target-headers.hmap" "-I/Users/return/Library/Developer/Xcode/DerivedData/MyApp-cwtxjgdpsvtoyxcfpytllmzaxceb/ArchiveIntermediates/MyApp - Distribution/IntermediateBuildFilesPath/MyApp.build/Distribution-iphoneos/MyApp.build/MyApp-all-target-headers.hmap" -iquote "/Users/return/Library/Developer/Xcode/DerivedData/MyApp-cwtxjgdpsvtoyxcfpytllmzaxceb/ArchiveIntermediates/MyApp - Distribution/IntermediateBuildFilesPath/MyApp.build/Distribution-iphoneos/MyApp.build/MyApp-project-headers.hmap" "-I/Users/return/Library/Developer/Xcode/DerivedData/MyApp-cwtxjgdpsvtoyxcfpytllmzaxceb/ArchiveIntermediates/MyApp - Distribution/BuildProductsPath/Distribution-iphoneos/include" "-I”/Users/return/Library/Developer/Xcode/DerivedData/MyApp-cwtxjgdpsvtoyxcfpytllmzaxceb/ArchiveIntermediates/MyApp" -I- "-IDistribution/BuildProductsPath/Distribution-iphoneos/../three20?" "-I“/Users/return/Library/Developer/Xcode/DerivedData/MyApp-cwtxjgdpsvtoyxcfpytllmzaxceb/ArchiveIntermediates/MyApp" -I- "-IDistribution/BuildProductsPath/Distribution-iphoneos/../../three20?" -Ithree20/Build/Products/three20 -I/Xcode4.2/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/include/libxml2 "-I/Users/return/Library/Developer/Xcode/DerivedData/MyApp-cwtxjgdpsvtoyxcfpytllmzaxceb/ArchiveIntermediates/MyApp - Distribution/IntermediateBuildFilesPath/MyApp.build/Distribution-iphoneos/MyApp.build/DerivedSources/armv7" "-I/Users/return/Library/Developer/Xcode/DerivedData/MyApp-cwtxjgdpsvtoyxcfpytllmzaxceb/ArchiveIntermediates/MyApp …

我正在创建一个示例处理程序来生成简单的Word文档.
本文档将包含文本Hello world

这是我使用的代码(C#.NET 3.5),
我创建了Word文档,但没有文本,大小为0.
我该如何修复它？
(我使用CopyStream方法,因为CopyTo仅在.NET 4.0及更高版本中可用.)

public class HandlerCreateDocx : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        using (MemoryStream mem = new MemoryStream())
        {
            // Create Document
            using (WordprocessingDocument wordDocument =
                WordprocessingDocument.Create(mem, WordprocessingDocumentType.Document, true))
            {
                // Add a main document part. 
                MainDocumentPart mainPart = wordDocument.AddMainDocumentPart();

                // Create the document structure and add some text.
                mainPart.Document = new Document();
                Body body = mainPart.Document.AppendChild(new Body());
                Paragraph para = body.AppendChild(new Paragraph());
                Run run = para.AppendChild(new Run());
                run.AppendChild(new …

调试我的应用时,我有此消息:

类NSZombie _GEOTileKeyWrapper在两者中都实现了？和?? ?? 将使用两者之一.哪一个未定义.

你知道这是什么吗？以及如何解决它？

你知道OpenUDID如何生成唯一的设备ID吗？
2个设备是否有可能具有相同的OpenUDID值？

编辑1:

设备重置后OpenUDID会改变吗？

编辑2:

如果碰撞是可能的,那么OpenUDID有什么替代方案可以更好地工作.

有没有办法在UISearchBar中重新定位UITextField？我想在UISearchBar中稍微移动UITextField.

我有几个对象如下:

public class Person
{
    string FirstName;
    string LastName;
    public Person(string fn, string ln)
    {
        FirstName = fn;
        LastName = ln;
    }
}

public class Team
{
    string TeamName;
    Person TeamLeader;
    List<Person> TeamMembers;

    public Team(string name, Person lead, List<Person> members)
    {
        TeamName = name;
        TeamLeader = lead;
        TeamMembers = members;
    }
}

public class Response
{
    int ResponseCode;
    string ResponseMessage;
    object ResponsePayload;
    public Response(int code, string message, object payload)
    {
        ResponseCode = code;
        ResponseMessage = message;
        ResponsePayload = payload;
    } …

我在Xcode 4.2中创建了一个全新的单视图应用程序 iPhone应用程序,它只显示灰色屏幕.

当我构建应用程序时,我收到警告:

BWARN]warning: iPhone apps with a deployment target lower than 4.3 should include an armv6 architecture (current IPHONEOS_DEPLOYMENT_TARGET = "3.0", ARCHS = "armv7").

我跟着这个SO,这个SO和这个SO来修复警告.

我的构建设置是:

• 架构:armv6,armv7
• 基础SDK:最新的iOS(iOS 5.0)
• iOS部署目标:iOS 3.0

Info.plist中的必需设备功能值是armv6,armv7.

我制作了应用程序的Ad Hoc发行版(此应用程序只显示灰色屏幕)并将其放在iTunes上.

1. 当我将应用程序安装到2个iPhone4(一个有iOS 4,一个有iOS 5)时,它工作正常.
2. 当我将应用程序安装到iPhone 3GS(具有iOS 4)时,它工作正常.
3. 但是
   当我尝试将应用程序安装到2个iPhone 3G(一个有iOS 4.2.1,一个有iOS 3.0)时,
   应用程序没有安装,我收到了这条消息.

应用程序"SingleViewApplication"未安装在iPhone XXXXX上,因为它与此iPhone不兼容.

你知道如何让iPhone 3G能够运行使用Xcode 4.2构建的应用程序吗？

我使用Visual Studio 2017并创建一个新的ASP.NET Core项目。我为Entity Framework Core添加迁移，如下所示

add-migration "Initial Create"

并得到以下错误：

Both Entity Framework Core and Entity Framework 6 are installed. The Entity Framework Core tools are running. Use 'EntityFramework\Add-Migration' for Entity Framework 6.
Build Failed.

您知道如何解决此错误吗？

更新1-2017年3月14日-运行命令后收到结果

PM> dotnet ef migrations add "Initial Create"

我看到以下输出，最后显示错误消息。

Welcome to .NET Core!
---------------------
Learn more about .NET Core @ https://aka.ms/dotnet-docs. Use dotnet --help to see available commands or go to https://aka.ms/dotnet-cli-docs.

Telemetry
--------------
The .NET Core tools collect usage data in order to …