遇到相关的警告,一般编译器都会提供解决方案,所以,作为新手,我们应该看懂编译器给我们的提示,这样我们解决问题就会事半功倍。
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 _datasource; 改为 __unsafe_unretained id _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.
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: @"xxxxxxxxxxxxxxxx",
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
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 。
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
这正常,但是不识别机器的。
解决方法:
把 ,
设置为以上相对应的版本就可以了。
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。