IOS-错误总结 - 爱码网

1，  错误信息：
  "_OBJC_CLASS_$ xxxxx ", referenced from:
      objc-class-ref in ViewController.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
解决方法：
查看工程，看是不是没有导入相关的框架。或者工程里添加的有相同".m",".h" 文件

2，  错误信息：
Couldn't register dy.CKRiLiText with the bootstrap server. Error: unknown error code.
This generally means that another instance of this process was already running or is hung in the debugger.Current language: auto; currently objective-c
解决方法：可能是电脑内存问题引起，重启电脑即可解决。如果重启解决不了问题，那就是你刚刚改动的代码引起的问题。

3 、错误信息：
ios 5是调试正常的，ios 6真机调试的时候,出现如下错误：ld: file is universal (3 slices) but does not contain a(n) armv7s slice: /Users/mac4/Desktop/my desktop/My app/MyApp name 20:09:12 /MyApp name/ZBarSDK/libzbar.a for architecture armv7serror: linker command failed with exit code 1 (use -v to see invocation)
解决方法：在Xcode里，点击相应的Target，然后点Build Settings，找到VALID_ARCHS，看里面的是不是arvm7s，如果不是改成arvm7s就可以了。

4 、错误信息：
error: receiver type 'ViewController' for instance message does not declare a method with selector 'hideSearchBar:' [4]
ViewController 中没有声明一个方法选择'hideSearchBar：
解决方法：
在ViewController .h 中声明一下这个方法 “ hideSearchBar ”  即可。

5、错误信息：当json从服务端请求时得到的字符串，如果这样写的话，会报错，';' after top level declarator
NSString *ss= @"{"recommend":"世界末日","dogname":"机器人"}";
解决方法：
就是，把 “   替换成  \" 即可。NSString *ss= @"{ \"recommend \": \"世界末日 \", \"dogname \": \"机器人 \"}";

6 、错误信息：
error: Existing instance variable '_datasource' for property 'datasource' with assign attribute must be __unsafe_unretained
解决方法：
     id<ListViewDataSource> _datasource; 改为     __unsafe_unretained id<ListViewDataSource> _datasource:即可

7 、错误信息：
error: No architectures to compile for (ONLY_ACTIVE_ARCH=YES, active arch=x86_64, VALID_ARCHS=i386).
解决方法：
     targets ->build setting 下的 Build Active Architecture Only 设置 NO  即可.

8 、错误信息：
error: failed to launch"/private/var/mobile/Applications/XX"-- timed out waiting for app to launch  .
解决方法：
     targets ->build setting 下的把证书选择为对应正确的开发证书  即可.

31，警告：
warning: Semantic Issue: Incompatible integer to pointer conversion assigning to 'BOOL *' (aka 'signed char *') from 'BOOL' (aka 'signed char')
解决办法：检查 BOOL ＊换为BOOL就可以了，检查是不是多写一个   ＊号。

32:Jsonkit中的警告
Direct access to objective-c's isa is deprecated in favor of object_setClass() and object_getClass()
object->isa 替换为 object_getClass(object)
keyObject->isa 替换为 object_getClass(keyObject)
(id)keys[idx]->isa 替换为 object_getClass((id)keys[idx])
format specifies type 'unsigned long' but the argument has type 'nsuinteger' (aka 'unsigned int')
给变量增加(unsigned long)进行类型转换

33：md5加密（iOS SDK中自带了CommonCrypto
Implicit declaration of function 'CC_MD5' is invalid in C99
[plain] view plaincopy
    #define CC_MD5_DIGEST_LENGTH 16
    +(NSString *)MD5HashForString:(NSString *)input {
        const char *cStr = [input UTF8String];
        unsigned char result[CC_MD5_DIGEST_LENGTH];
        CC_MD5(cStr, strlen(cStr), result);
        return [NSString stringWithFormat: @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
                result[0], result[1], result[2], result[3],
                result[4], result[5], result[6], result[7],
                result[8], result[9], result[10], result[11],
                result[12], result[13], result[14], result[15]];
    }
引入函数定义的头文件
#import <CommonCrypto/CommonDigest.h>

34:ASIDataDecompressor中的警告
format specifies type  'short' but the  argument has type 'int'
在+ (NSError *)deflateErrorWithCode:(int)code 和 +(NSError *)inflateErrorWithCode:(int)code中
［NSString stringWithFormat:@"Compression of data failed with code %hi",code] 中
将code改为 (short)code,类型转换

35：Reachability中警告
Using 'stringWithString:' with a literal is redundant
statusString = [NSString stringWithString: @"Not Reachable"];
改为：statusString = @"Not Reachable";

36.format specifies type 'id' but the argument has type 'const char *'
NSCAssert(NO, @"Unhandled error encountered during SAX parse. msg is %@", msg);
改为：NSCAssert(NO, @"Unhandled error encountered during SAX parse. msg is %@", [NSString stringWithUTF8String:msg]);

37 Using 'stringWithString:' with a literal is redundant
改为：self.locationInput.text = @"captured change";

38 在项目中设置控件的layer属性时，会发生错误,
"Property 'c' cannot be found in forward class object 'CALayer *",
这时需要引入  #import <QuartzCore/CALayer.h>。

39 在项目中变量未初始化会报警告,
"Variable 'type' may be uninitialized when used here",
这时需要初始化相应的变量即可  。

41,错误

Error launching remote program: failed to get the task for process

解决方法：
把真机上的软件，删除，然后，clean 一下，重新运行就可以了。


42,真机调试的时候，出现   43,真机调试的时候，出现   ios Broken pipe

解决方法：
:推出xcode
:断开机器(iphone,ipad,ipod)链接
:重启iPhone在联接xcode，就可以了。