直接上代码！
1.控制台打印
NSString *idfa = [[ASIdentifierManager sharedManager].advertisingIdentifier UUIDString];
NSLog(@"本机idfa=%@",idfa);//控制台查看
2.使用弹窗显示并复制
NSString *idfa = [[ASIdentifierManager sharedManager].advertisingIdentifier UUIDString];
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"本机IDFA" message:idfa preferredStyle:UIAlertControllerStyleAlert];
[alertController addAction:[UIAlertAction actionWithTitle:@"复制" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
UIPasteboard *pab = [UIPasteboard generalPasteboard];
pab.string = idfa;
}]];
[[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:alertController animated:YES completion:nil];
