這aciton被稱爲:UISlider滑動時aceess通過發送者和
-(IBAction) sliding:(id)sender{
UISlider *temp = (UISlider *) sender;
int value = (int)temp.value;
val.text= [[NSString alloc]initWithFormat:@"%i",value ]; // val is the name oflabel
}
但是,當我這樣做:
-(IBAction) sliding:(id)sender{
int value = (int)sender->value;// ERROR(no member named value) WHY ?
val.text= [[NSString alloc]initWithFormat:@"%i",value ]; // val is the name of label
}
我怎樣才能得到滑塊的值,而無需創建UISlider實例類
如果您的目標是將發件人保留爲通用'id',我不確定這是否有幫助,但是[發件人描述]可以格式化以顯示值 – John