UIPickerView
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//首先先要实现UIpickerView的两个协议
@interface YcwSecondViewController : UIViewController<UIPickerViewDataSource,UIPickerViewDelegate>
//实现相应的方法
//确定UIpickerView的Component个数(列数)
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 1;
}
//确定每个Component的row值(行值)
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
return [mArray count];
}
//为每行设标题值
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
return [mArray objectAtIndex:row];
}
//别忘将delegate,dataSource赋给自己
self.myPickerView.delegate = self;
self.myPickerView.dataSource = self;
//要想获得UIPickerView所选中的内容,先要获得该选中的row值,再根据row值到dataSource中取得
NSInteger myRow = [self.myPickerView selectedRowInComponent:0];
//在mArray中根据row值取出被选中行的值
NSString *string = [mArray objectAtIndex:myRow];
self.myLabel.text = string;
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