Xcode中使用Picker View和Segue， Size to fit content

调整控件中的内容，会使内容和控件显示出现问题，快速适配 Editor－>Size to fit content 可以快速使控件适配内容，亦或快捷键 command ＋＝，当然，前提选择控件。

使用Picker View 需要实现三个方法，继承UIPickerViewDataSource,UIPickerViewDelegate

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int{

return 1;// 列数

}

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{

return lijians.count;  //行数

}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {

return lijians[row];

}并且设置代理和数据源

 

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

if segue.identifier == “A”{  //判断segue，用处极大，判断调转那个页面

let index = Picker.selectedRowInComponent(0)

var vc = segue.destinationViewController as! Second  //强制转换成Second，在前一页就可以给后一页赋值，很棒

vc.ss = flag