在一个UIView中如何使用多个UIPickerView

可以现在storyboard的UIView中拖入多个UIPickerView

然后同样是继承相关的UIPickerView协议

<UIPickerViewDataSource,UIPickerViewDelegate>

接着重写相关方法，在里面加入if判断即可

如下：

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    _checkItemArray=[NSArray arrayWithObjects:@"十二导常规心电",@"test", nil];
    _applyArray=[NSArray arrayWithObjects:@"ECG",@"TEST", nil];
    _applyDocArray=[NSArray arrayWithObjects:@"工程师", @"test",nil];
    
    self.checkItemPicker.dataSource=self;
    self.applyPicker.dataSource=self;
    self.applyDocPicker.dataSource=self;
    
    self.checkItemPicker.delegate=self;
    self.applyPicker.delegate=self;
    self.applyDocPicker.delegate=self;
    
}

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    if (pickerView==self.checkItemPicker)
    {
        return _checkItemArray.count;
    }
    else
        if (pickerView==self.applyPicker)
        {
            return _applyArray.count;
        }
        else
        {
            return _applyDocArray.count;
        }
}

-(UIView*)pickerView:(UIPickerView*)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    UILabel *myView=nil;
    
    myView=[[UILabel alloc]initWithFrame:CGRectMake(0.0, 0.0, 264, 30)];
    myView.textAlignment=NSTextAlignmentRight;
    
    if (pickerView==self.checkItemPicker) {
        myView.text=[_checkItemArray objectAtIndex:row];
        
    }else if(pickerView==self.applyPicker){
        myView.text=[_applyArray objectAtIndex:row];
    }else{
        myView.text=[_applyDocArray objectAtIndex:row];
    }
    myView.font=[UIFont systemFontOfSize:17];
    myView.textColor=[UIColor blackColor];
    myView.backgroundColor=[UIColor clearColor];
    return  myView;
    
}