IOS开发之——Undefined symbol:_OBJC_CLASS

发布时间：2023-03-25 11:27:37 所属栏目：教程来源：

导读：现象导入MBProgressHUD显示信息时，出现如下异常现象Undefined symbols for architecture x86_64: "_OBJC_CLASS_$_MBProgressHUD", referenced from: objc-class-ref in ViewController.old: symbol(s) not found fo

现象导入MBProgressHUD显示信息时，出现如下异常现象Undefined symbols for architecture x86_64: "_OBJC_CLASS_$_MBProgressHUD", referenced from: objc-class-ref in ViewController.old: symbol(s) not found for architecture x86_64clang: error: linker command failed wit

一现象
导入MBProgressHUD显示信息时，出现如下异常现象

Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_MBProgressHUD",referenced from:
objc-class-ref in ViewController.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command Failed with exit code 1 (use -v to see invocation)
Undefined symbol: _OBJC_CLASS_$_MBProgressHUD
二原因
编译程序(cc -c 要编译到程序名)，生成“ViewController.o”文件时，找不到OBJC_CLASS_$_MBProgressHUD

三解决办法
3.1 新建MBProgress并将MBProgressHUD中的内容copy到MBProgress中
添加MBProgressHUD后的项目结构

ViewController.m如何引用

#import "MBProgressHUD/MBProgressHUD+MJ.h"
MBProgress代替MBProgressHUD后

ViewController.m如何引用

#import "MBProgressHUD+MJ.h"
3.2 Build Phases添加编译文件和Resources资源文件
Compile Sources—添加.m文件
依次点击：项目—>TARGETS—>01-xxx—>Build Phases——>Compile Sources——>+号，将如下文件添加进来

MBProgressHUD.m
MBProgressHUD+MJ.m

copy Bundle Resources——添加资源文件(图片)
依次点击：项目—>TARGETS—>01-xxx—>Build Phases——>Compile Bundle Resources——>+号，将如下文件添加进来

MBProgressHUD.bundle

四使用
4.1 代码
[MBProgressHUD showError:@"请输入用户名"];

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