IQUIView+IQKeyboardToolbar.m文件里面，找到这一个，替换成initWIthTitle这个方法
// IQBarButtonItem *doneButton =[[IQBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:target action:doneAction];
IQBarButtonItem *doneButton =[[IQBarButtonItem alloc] initWithTitle:@"完成" style:UIBarButtonItemStyleDone target:target action:doneAction];
方法二 ：
info.plist文件中
Localization native development region 设置为china
