PickerView居中,循环显示一系列

//
//  SensorAddDeleteViewController.m
//  Abviewer_iPhone
//
//  Created by Ken.zhao on 13-11-20.
//  Copyright (c) 2013年 sven. All rights reserved.
//

#import "SensorAddDeleteViewController.h"
#import "ABServices.h"
#import "FormatWeekListViewController.h"


@interface SensorAddDeleteViewController ()

@end

@implementation SensorAddDeleteViewController
@synthesize m_pickerSensor;
@synthesize m_mutArrSensorList;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor colorWithPatternImage:K_contentsOfFile(@"Background", @"png")];
    
    NSMutableArray *mutArrSensorList = [[NSMutableArray alloc] initWithArray:[FormatWeekListViewController resultAllSersonName]];
    self.m_mutArrSensorList = mutArrSensorList;
    [mutArrSensorList release];
    
	UIPickerView *pickerSensor = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 100, 320, 220)];
    self.m_pickerSensor = pickerSensor;
    [pickerSensor release];
    m_pickerSensor.delegate = self;
    m_pickerSensor.dataSource = self;
    m_pickerSensor.showsSelectionIndicator = YES;
    [self.view addSubview:m_pickerSensor];
    
　　//这里是初始化，自动转一圈，避免第一次是数组第一个值造成留白
    [m_pickerSensor selectRow:[m_mutArrSensorList count] inComponent:0 animated:YES];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void)dealloc
{
    [m_pickerSensor release];
    [m_mutArrSensorList release];
    [super dealloc];
}
#pragma mark -
#pragma mark pickview delegate
//组件数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

//每个组件的行数
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return [m_mutArrSensorList count]*50;
}

//初始化每个组件每一行数据
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    return [m_mutArrSensorList objectAtIndex:(row%[m_mutArrSensorList count])];
}

//选中picker cell,save ArrayIndex
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    NSUInteger max = 0;
    NSUInteger base10 = 0;
    if(component == 0)
    {
        max = [m_mutArrSensorList count]*50;
        base10 = (max/2)-(max/2)%[m_mutArrSensorList count];
        [pickerView selectRow:[pickerView selectedRowInComponent:component]%[m_mutArrSensorList count]+base10 inComponent:component animated:false];
    }
}

//替换text居中
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(12.0f, 0.0f, [pickerView rowSizeForComponent:component].width-12, [pickerView rowSizeForComponent:component].height)];
    
    label.text = [m_mutArrSensorList objectAtIndex:(row%[m_mutArrSensorList count])];//[m_mutArrSensorList objectAtIndex:row-1];
    label.textAlignment = UITextAlignmentCenter;
    return [label autorelease];
}
@end