详解iOS开发中UIPickerView控件的使用方法

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#import <UIKit/UIKit.h>

 

@interface ViewController : UIViewController<UIPickerViewDelegate, UITextFieldDelegate,UIPickerViewDataSource>
{
    NSArray *pickerArray;
    NSArray *subPickerArray;
    NSDictionary *dicPicker;
}
- (IBAction)selectButton:(id)sender;
@property (strong, nonatomic) IBOutlet UIToolbar *doneToolbar;
@property (strong, nonatomic) IBOutlet UIPickerView *selectPicker;
@property (strong, nonatomic) IBOutlet UITextField *textField;
@end

2、初始化
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- (void)viewDidLoad
{
    [super viewDidLoad];
    pickerArray = [NSArray arrayWithObjects:@"动物",@"植物",@"石头", nil];
    dicPicker = [NSDictionary dictionaryWithObjectsAndKeys:
                 [NSArray arrayWithObjects:@"鱼",@"鸟",@"虫子",            nil], @"动物",
                 [NSArray arrayWithObjects:@"花",@"草",@"葵花",            nil], @"植物",
                 [NSArray arrayWithObjects:@"疯狂的石头",@"花岗岩",@"鹅卵石", nil], @"石头",nil];
    
    subPickerArray = [dicPicker objectForKey:@"动物"];
    textField.inputView = selectPicker;
    textField.inputAccessoryView = doneToolbar;
    textField.delegate = self;
    selectPicker.delegate = self;
    selectPicker.dataSource = self;
    selectPicker.frame = CGRectMake(0, 480, 320, 216);

 

}

给 NSDictionary *dicPicker;赋值，对应的三个关键字添加了对应的数组。
3、Component返回两个，这样就有两个齿轮了。
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-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
    return 2;
}
4、使用宏
在#import "ViewController.h"下面定义两个宏，代表UIPickerView齿轮的左边的部分和右边的部分。左边的部分是0，右边的是1.