使用UIToolBar给textFiled的inputView添加按钮

• 首先，textField的inputView属性可以指定其他视图代替keyBoard弹出。

  // 创建工具条
  UIToolbar *toolBar = [[UIToolbar alloc] init];
  // 设置工具条的颜色
    toolBar.barTintColor = [UIColor cyanColor];
  // 设置工具条的frame
  toolBar.frame = CGRectMake(0, 0, self.view.frame.size.width, 44);
  // 给工具栏添加按钮
  UIBarButtonItem *item1 = [[UIBarButtonItem alloc] initWithTitle:@"上一个" style:UIBarButtonItemStylePlain target:self action:@selector(itemAction)];
  UIBarButtonItem *item2 = [[UIBarButtonItem alloc] initWithTitle:@"下一个" style:UIBarButtonItemStylePlain target:self action:@selector(itemAction)];
  UIBarButtonItem *flexibleItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
  UIBarButtonItem *item3 = [[UIBarButtonItem alloc] initWithTitle:@"完成" style:UIBarButtonItemStylePlain target:self action:@selector(itemAction)];
  toolBar.items = @[item1, item2, flexibleItem, item3];
  self.textFiled.inputAccessoryView = toolBar;