iOS中实现键盘右上角完成按钮

继承UITextField,重写drawRect方法

- (void)drawRect:(CGRect)rect {
    [superdrawRect:rect];
    UIToolbar *bar = [[UIToolbaralloc] initWithFrame:CGRectMake(0,0, SCREEN_WIDTH,44)];
    UIButton *button = [[UIButtonalloc] initWithFrame:CGRectMake(SCREEN_WIDTH - 60, 7,50, 30)];
    [button setTitle:@'完成'forState:UIControlStateNormal];
    [button setTitleColor:[UIColorredColor] forState:UIControlStateNormal];
    button.layer.borderColor = [UIColorredColor].CGColor;
    button.layer.borderWidth =1;
    button.layer.cornerRadius =3;
    [bar addSubview:button];
    self.inputAccessoryView = bar;
    [button addTarget:selfaction:@selector(print)forControlEvents:UIControlEventTouchUpInside];
}
``