遇到过——Xcode开发错误、警告⚠️——小集合

1.

error:

Assertion failure in -[UITextView _firstBaselineOffsetFromTop], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit/UIKit-3512.60.12/UITextView.m

description:

点击Xcode debug view hierarchy，console输出的警告信息，并且hierarchy并不可见。

solution:

在UITextView的category的implementation文件中加入以下两个方法：

@implementation UITextView (Category)

- ( void )_firstBaselineOffsetFromTop

{ 

}

- ( void)_baselineOffsetFromBottom

{   

}

@end

2.

error:

Xcode错误"The working ... has uncommitted changes"解决方案

description:

有时候想切换到其他的branch或者试图执行merge、pull、push等操作，即使未做任何修改，也会报出这个错误，因为真正的内容没有任何修改，因此推测可能是某些状态文件或者描述文件在捣鬼。

solution:

只需要进入项目文件夹目录下，分别执行以下两行代码即可。

git rm --cached *.xcuserstate

git rm --cached *.xcuserdata

3.

error:

Application Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app's Info.plist file.

description:

参考： http://my.oschina.net/vimfung/blog/494687

solution:

在iOS9 beta中，苹果将原http协议改成了https协议，使用 TLS1.2 SSL加密请求数据。

解决办法：修改info.plist文件

4.

error:

Assertion failure in -[AFHTTPRequestSerializer requestWithMethod:URLString:parameters:error:] —>reference URL

solution:

NSString *url = [ NSString stringWithFormat : @"http://%@/api" , kIp ];

加上 —>>> url = [url stringByAddingPercentEscapesUsingEncoding : NSUTF8StringEncoding ];

5.

error:

CGContextSetStrokeColorWithColor: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability.

solution:

在DrawRect:里加上以下两句：

CGContextRef *context =  UIGraphicsGetCurrentContext();

UIGraphicsPushContext( context )；

6.

error:

"_OBJC_CLASS_$_className", referenced from: 

description:

根据个人经验，推测一般是对应的.m实现文件丢失引起的。定义了.h文件，忘记实现.m也会报这个错误。

solution:

Tagert--Build Phases -- Compile Sources 下添加对应的 .m 文件

或者

实现.m 

@implementation

@end

7.

error:

Assertion failure in -[AFStreamingMultipartFormData appendPartWithHeaders:body:]

description:

AFN 上传图片，发生这个错误：因为在 AFN 的方法里面写了图片上传
： [formData appendPartWithFileData:imageData name:@"picture" fileName:@"tupian.jpg" mimeType:@"image/jpeg"];

但是当时又没有上传，所以要进行判断。  

solution:

    [manager POST:[NSString stringWithFormat:@"%@node/addNote" , url] parameters:dict constructingBodyWithBlock:^(id formData) {
            if (imageData!=nil) {   //  图片数据不为空才传递
            [formData appendPartWithFileData:imageData name:@"picture" fileName:@"tupian.jpg" mimeType:@"image/jpeg"];
            }
        } success:^(AFHTTPRequestOperation *operation, id responseObject) {

            NSLog(@"发送成功：%@" , responseObject) ; 

8.error:

Error Domain=AFNetworkingErrorDomain Code=-1016 "Request failed: unacceptable content-type: ….

description:

出现这个错误是因为AFN只支持text/json，application/json，text/javascript这几种格式，

solution:

解决方法有两个:

1.直接在AFURLResponseSerialization.m文件中搜索 

self.acceptableContentTypes，然后直接添加@“text/html",@"text/plain”,@“video/mpeg" 就可以解决问题。

2.代码中添加解决问题

self.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript",@"text/html”,@"text/plain" ,@“video/mpeg", nil];

9.
error:

Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (JSON text did not start with array or object and option to allow fragments not set.) UserInfo=0x9152780 {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

description:

JSON解析错误

solution:

加上以下代码即可：

manager.responseSerializer = [AFJSONResponseSerializer serializer];

10.

error:

The certificate used to sign "XXX" has either expired or has been revoked. An updated certificate is required to sign and install the application.

description:

由于最近频繁更换电脑开发，因此经常遇到这个问题。

在另一台机器上登陆过账号并且真机运行后，本机的证书都会失效，一般情况下，遇到这个问题以后：

1.keyChainAccess中查看是否有过期的证书或者无效的证书

2.到工程的target中选择正确的证书

3.再次运行弹出提示框，并选择Fix issue修复即可解决问题。

这次出现这个问题是因为Xcode从7.3.1升级到Xcode8.0。

首先尝试解决问题

1.查看keyChainAccess并未发现证书失效，target->general->signing中也已经选择正确的证书

2.Xcode->preferences->Accounts，账号正确。Run，仍有问题。

3.Xcode Menu -> preferences -> Account -> Team -> View Details -> Signing Identities ->Mac Development -> Create

4.尝试clean、重启，也没解决问题。

solution:

在网上查询资料后，终于找到解决的方案：

1.clean the project

2.Xcode Menu -> preferences -> Account -> Team -> View Details

3.selectanyprovisioning profile from Provisioning Profiles list -> Right Click -> Show in Finder

4.select all provisioning profiles and move them to trash

5. ..-> View Detail -> Download All Profiles

Run it again and it should work.

11.

error:

.cxx_destruct crash

description:

release object which is already nil

12.

error:

真机调试情况下：

dyld: Library not loaded: @rpath/IHFKit.framework/IHFKit
  Referenced from: /var/containers/Bundle/Application/DF33E1CB-0A69-4303-A22A-686E643DE922/iDoctors.app/iDoctors
  Reason: no suitable image found.  Did find:
/private/var/containers/Bundle/Application/DF33E1CB-0A69-4303-A22A-686E643DE922/iDoctors.app/IHFKit.framework/IHFKit: code signing blocked mmap() of '/private/var/containers/Bundle/Application/DF33E1CB-0A69-4303-A22A-686E643DE922/iDoctors.app/IHFKit.framework/IHFKit'

Message from debugger: Terminated due to signal 6

description:

此处 IHFKit是动态库。

-1.真机调试时动态库签名需与项目签名一致。

-2. 若commit的时候把个人用的动态库一起push到分支上，那么teammate拉了代码以后将其本地的动态库签名替换成提交者的签名，与其本地签名不一致，就会导致出现该问题-fatal error @#$%^&*..问题，只需要对动态库重签名一次即可。

-3 .keychain中证书一般是两个，一个个人的开发者证书，另一个则是在公司的group中的开发证书。

-4.如果keychain中有其他的过期或其他原因引起的重复失效证书，同样可能会导致fatal error问题。

-5.如果fatal error，最直接的方法就是重签名

-6. 查看动态库的签名证书  codesign -d -vv IHFKit.framework    — (在动态库所在目录下的执行该命令)

solution :

动态库重签名步骤：

-1. 删除原有IHFKit.framework母包的签名信息

删除_CodeSignature目录

-2.用个人开发证书重签名

1）列出电脑上可用的签名。打开Mac终端，输入

/usr/bin/security find-identity -v -p codesigning

2）根据使用IHFKit的App所使用的签名，对（动态库名）.framework重签名。终端输入

codesign -fs “iPhone Developer: xxxx (XXXX)” （动态库名）.framework
重签名后的动态库即可用于开发人员真机调试了。

-3. 查看动态库的签名证书  codesign -d -vv IHFKit.framework    — (在动态库所在目录下的执行该命令) 

13. 

error:

This app has crashed because it attempted to access privacy-sensitive data without a usage description. The app's Info.plist must contain an NSPhotoLibraryUsageDescription key with a string value explaining to the user how the app uses this data.

description:

iOS10开发权限问题

solution:

需要在info.plist文件中添加一对key-value属性，key是NSPhotoLibraryUsageDescription，value可随意写。可以直接打开添加，也可以通过SourceCode添加以下

NSPhotoLibraryUsageDescription

photoDescription

还有一些其他可能以为权限引起的问题，可一并添加解决：

NSCameraUsageDescription

      cameraDesciption

NSContactsUsageDescription

      contactsDesciption

NSMicrophoneUsageDescription

      microphoneDesciption

>

14.

error:

 XXXX  requires a provisioning profile. Select a provisioning profile for the "Debug" build configuration in the project editor.

Code signing is required for product type 'Application' in SDK 'iOS 10.1’

description:

由于Xcode8更新了provision profile引起

solution:

1. 到project -> general中修改signing，选中automatically manage signing

2. 选择enable automatic

3.选择相应的开发者账号即可，如下:

15.

error:

Command /Applications/Xcode.app/Contents/Developer/usr/bin/copypng failed with exit code 2

solution:

打开工程project->BuildPhases->Copy Bundle Resources,找到对应文件删除

16.

error:

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'An instance 0x1461f8600 of class UICollectionView was deallocated while key value observers were still registered with it. Current observation info: (

Context: 0x100f29308, Property: 0x170245610>
Context: 0x100f2930c, Property: 0x17025d940>
)'
*** First throw call stack:
(0x1846541c0 0x18308c55c 0x184654108 0x1850a1df4 0x1830a5fe0 0x18452ddb8 0x18a718db0 0x18a7393bc 0x1846017dc 0x1845ff40c 0x1845ff89c 0x18452e048 0x185fb1198 0x18a500818 0x18a4fb550 0x10065f130 0x1835105b8)

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

description:

• You have to ensure that the view you will assign to inputView or inputAccessoryViewdoesn't belong to any parent view. When you create these views from a xib inside a ViewController, by default they are set as subviews of a superview.

solution:

• Use the method removeFromSuperview on the view you will assign to inputView or inputAccessoryView

textView.inputView = myInputView;
[myInputView removeFromSuperview];
[textView becomeFirstResponder];