ios-UIPickerView基本使用

#import "ViewController.h"



@interface ViewController ()<UIPickerViewDataSource,UIPickerViewDelegate>

{

    NSArray *pickerArray;

}

@property (weak, nonatomic) IBOutlet UIPickerView *myPickerView;



@end



@implementation ViewController



- (void)viewDidLoad

{

    [super viewDidLoad];

    _myPickerView.dataSource=self;

    _myPickerView.delegate=self;

    _myPickerView.showsSelectionIndicator=YES;

    pickerArray=[NSArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10", nil];

   

}



- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView

{

    return 3;

}

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component

{

    return pickerArray.count;

}



-(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view

{

    CGRect rect=CGRectMake(0, 0, [self pickerView:pickerView widthForComponent:row], [self pickerView:pickerView rowHeightForComponent:row]);

    UIView *testView=[[UIView alloc]initWithFrame:rect];

    [testView setBackgroundColor:[UIColor clearColor]];

    [testView setOpaque:YES];

    UILabel *label=[[UILabel alloc]initWithFrame:CGRectMake(8, 0, [self pickerView:pickerView widthForComponent:row]-16.0f, [self pickerView:pickerView rowHeightForComponent:row])];

    [label setBackgroundColor:[UIColor clearColor]];

    label.textAlignment=NSTextAlignmentCenter;

    label.text=pickerArray[row];

    switch (row)

    {

        case 1:

        case 2:

        {

            testView.backgroundColor=component==0?[UIColor greenColor]:[UIColor blueColor];

        }

        case 3:

        {

            testView.backgroundColor=component==0?[UIColor brownColor]:[UIColor redColor];

        }

        break;

        default:

        {

            testView.backgroundColor=component==0?[UIColor grayColor]:[UIColor orangeColor];

        }

        break;

    }

    label.font=[UIFont boldSystemFontOfSize:14.0f];

    [testView addSubview:label];

    return testView;

}



//可有可无

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component

{

    return pickerArray[row];

}

- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component;

{

    return 120;

}

-(CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component

{

    return 50;

}



- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component

{

    

     NSLog(@"row=%ld",row);

}