ios中关于动态加载判断这种特殊需求的应用

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////  ViewController.m//  CJHRecorder////  Created by 曹敬贺 on 2017/8/29.//  Copyright © 2017年 上海欢岳网络科技有限公司. All rights reserved.//#import "ViewController.h"#import <Metal/Metal.h>#include <dlfcn.h>//定义函数指针typedef id<MTLDevice> (*CJH_Device)();@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    //    https://www.dwheeler.com/program-library/Program-Library-HOWTO/x172.html    //    id<MTLDevice> (*CJH_Device)();    //获取MTLCreateSystemDefaultDevice函数    //注意：函数指针接收的MTLCreateSystemDefaultDevice函数有几个参数和什么返回类型要一致    CJH_Device  device = dlsym(dlopen(0, RTLD_LOCAL | RTLD_LAZY), "MTLCreateSystemDefaultDevice");        id<MTLDevice> d = device();        id<MTLDevice> d1 = MTLCreateSystemDefaultDevice();        NSLog(@"Device:%@ - %@",d,d1);        char * err;        if ((err = dlerror()) != NULL) {                NSLog(@"TTT");            } else {                NSLog(@"FFFF");            }}@end

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