前言：该选择器为iOS自带方法，可以用于任意需要选择的界面，如时间、地址等的选择，此处仅简略介绍其用法。使用UIPickerView必须声明协议,实现方法并设置代理。
UIPickerView的基本创建
1.UIPickerView的创建
UIPickerView * myPickerView = [[UIPickerView alloc]init];
myPickerView.frame = CGRectMake(0, HEIGHT_FOR_SCREEN - 150, WIDTH_FOR_SCREEN, 150);
myPickerView.dataSource = self;
myPickerView.delegate = self;
myPickerView.showsSelectionIndicator = YES;
myPickerView.backgroundColor = [UIColor lightGrayColor];
[self.view addSubview:myPickerView];
以上写法仅为展示
2.协议方法
#pragma mark-<UIPickerViewDataSource>
//设定分区数，即该选择器有多少个列
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return pickerArray.count;
}
//设定每个分区内的元素个数-(NSInteger)pickerView:(UIPickerView *)pickerViewnumberOfRowsInComponent:(NSInteger)component{
NSArray * tmpArray = pickerArray[component];
return tmpArray.count;
}
#pragma mark-<UIPickerViewDelegate>
//设置选择器内元素显示的名字
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:
(NSInteger)row forComponent:(NSInteger)component{
NSArray * tmpArray = pickerArray[component];
return [tmpArray objectAtIndex:row];
}
//选中选择器元素（未拨动的部分为未选择状态）
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:
(NSInteger)row inComponent:(NSInteger)component{
// [myTextField setText:[pickerArray objectAtIndex:row]];
NSArray * tmpArray = pickerArray[component];
switch (component) {
case 0:
yearStr = tmpArray[row];
break;
case 1:
monthStr = tmpArray[row];
break;
case 2:
dayStr = tmpArray[row];
break;
default:
break;
}
NSString * tmpTitleStr = [NSString stringWithFormat:@"%@ %@ %@",yearStr,monthStr,dayStr];
[myTimeButton setTitle:tmpTitleStr forState:(UIControlStateNormal)];
}
3.附注（数据部分）：
yearArray = [[NSMutableArray alloc]initWithObjects:@"2015",@"2016",@"2017",@"2018",@"2019", nil];
monthArray = [[NSMutableArray alloc]initWithObjects:@"一月",@"二月",@"三月",@"四月", nil];
dayArray = [[NSMutableArray alloc]initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6", nil];
pickerArray = [[NSMutableArray alloc]initWithObjects:yearArray,monthArray,dayArray, nil];
yearStr = [[NSString alloc]init];
monthStr = [[NSString alloc]init];
dayStr = [[NSString alloc]init];
附上相关资料，即UIPickerView常用的使用方法——与UITextField结合使用：选择器的使用
二、UIPickerView的常用方法
通过component确定其下的行数（从0开始）
theRow = [_pickerview selectedRowInComponent:theComponent];
备注
第一部分内容未使用markdown语法，代码结构比较混乱
