求助各位大佬，新建的typescript脚本如何监听值的变化

Creator 2.x
#1

新建的一个继承自cc.Component的脚本，添加一个属性例如
@property({type:cc.Boolean})
isCheck:cc.Boolean = false;

如何监听isCheck的值的setter
直接在脚本中写会报错
public set isCheck(check:cc.Booolean){
this.isCheck = check;
//do something
}

#2 
@property(cc.Label)
private tipLabel: cc.Label = null;
@property
private _text: string = '';

@property({
    type: cc.String
})
public get string(): string {
    return this._text;
}
public set string(value) {
    this.notify(this._text, value);
    this._text = value;

}
private notify(oldValue: string, newValue: string) {
    console.log(`oldValue:${oldValue},newValue:${newValue}`);
    if (!!this.tipLabel) {
        this.tipLabel.string = `oldValue:${oldValue},newValue:${newValue}`;
    }
}
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