iOs5，试图了解UIPickerView以及如何将它连接到我的自定义类

Question

好吧我试图连接一个UIPickerView自定义类。这个想法是在一个普通视图中有3个选择器视图。

1. 到目前为止，我已创建了一个视图并将其绑定到我的班TestView.h
2. 然后我在故事板上增加了一个选择器视图的视图（iOS 5中）

3. 然后我创建了一个类这个选择器视图：

   @interface TestPickerView : UIPickerView <UIPickerViewDelegate, UIPickerViewDataSource> 
   { 
       NSArray *data; 
   } 
   

4. 然后尝试将属性添加到我的正常视图（TestView.h）

   #import "TestPickerView.h" 
   @interface TestView : UIViewController 
       @property (strong, nonatomic) IBOutlet TestPickerView *myTestPicker; 
   @end 
   

但是，我如何将我的普通视图内的UIPickerView绑定到这个类/属性？

我会最终得到3个UIPickerView，我的想法是在我的UIViewController中有3个参考来控制这些UIPickerViews。这样，我可以在普通视图加载时使用属性设置数据（数据源），然后PickerViews只显示。希望当我看到其中一个视图的值发生时，我也能够在正常视图中得到通知。

Answer 1

请改为拨打您的TestView >>TestViewController，因为它是控制器。

在故事板中，选择PickerView并将其类名更改为TestPickerView。

之后，只需创建你的三个IBOutlets并连接PickerViews。而已。

//编辑：为了解释，你如何区分捡拾者。把3个网点，如：

IBOutlet TestPickerView *picker1; 
IBOutlet TestPickerView *picker2; 
IBOutlet TestPickerView *picker3; 

，比你的委托方法，检查其选择器没有调用该委托，例如：

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component 
{ 
    if(pickerView == self.picker1) 
    { 
     // picker1 
    } 
    else if(pickerView == self.picker2) 
    { 
     // picker2 
    } 
    else 
    { 
     // picker3 
    } 
} 

Answer 2

在这里你去老兄，我这是怎么做的几个我的应用程序和游戏。

#import <UIKit/UIKit.h> 
    #pragma mark - Delegate Protocol 
    @protocol someDelegate 
    @required 
    -(void)somePickerFinishedPicking:(id)item; 
    @end 

    #pragma mark - Class interface 
    @interface SomePicker : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource> 
    { 
     NSMutableArray* dataSource; 
    } 

    #pragma mark - Property Istantiation 

    @property (nonatomic, retain) NSMutableArray* dataSource; 
    @property (nonatomic, retain) id <someDelegate> pickDelegate; 

    #pragma mark - Constructors/Destructors 

    - (id) initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil; 
    - (void) didReceiveMemoryWarning; 
    - (void) dealloc; 
    - (void) createDataSource; 

    #pragma mark - View Lifecycle 
    - (void) viewDidLoad; 

    #pragma mark - UIPicker Protocols 

    -(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component; 
    -(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView; 
    -(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component; 
    -(UIView*) pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view; 

    #pragma mark - Delegate Protocols 

    -(void) handlePickerDidFinish:(id)item; 

    @end 

这为您的m

#pragma mark - Class Implementation 
@implementation SomePicker 

#pragma mark - Variable synthesize 
// ARRAYS 
@synthesize dataSource; 

// DELEGATES 
@synthesize pickDelegate = _pickDelegate; 

#pragma mark - Constructors/Deconstructors 
// Class initialization 
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil; 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     dataSource = [[NSMutableArray alloc] init]; 
     [self createDataSource]; 
    } 
    return self; 
} 

// Handles memory warning events 
- (void)didReceiveMemoryWarning 
{ 
    // Release the view if it doesn't have a superview. 
    [super didReceiveMemoryWarning]; 

    // Release any cached data, images, etc that aren't in use. 
} 

// Garbage Collection 
- (void) dealloc; 
{ 
    // Release what you need 
    self.dataSource = nil; 
    [super dealloc]; 
} 

// Creates the occasion entries for the picker 
-(void)createDataSource 
{ 
    NSMutableDictionary* dataDictionary = [[NSMutableDictionary alloc] init]; 
    // create your data source here or just forget about this and pass it from the parentViewController. 
    [dataDictionary release]; 
} 

#pragma mark - View lifecycle 
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib. 
- (void)viewDidLoad; 
{ 
    [super viewDidLoad]; 

    UIPickerView* occasionsPicker = [[UIPickerView alloc] init]; 
    [occasionsPicker setDataSource:self]; 
    [occasionsPicker setDelegate:self]; 
    [occasionsPicker setTag:888]; 
    [occasionsPicker selectRow:500 inComponent:0 animated:YES]; 
    [self.view addSubview:occasionsPicker]; 
    [occasionsPicker release]; 

    [self handlePickerDidFinish:[[self.dataSource objectAtIndex:(500 % self.dataSource.count)] objectForKey:@"key"]]; 
} 

#pragma mark - UIPicker Protocols 

// Creates the rows in the picker. 
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component 
{ 
    // Endless roll illusion else just bind it to the size of the data source 
    return 1000; 
} 

// Determines the number of columns in the picker 
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView 
{ 
    // Add however many columns you need 
    return 1; 
} 

// Handles the event when the user picks a row. 
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component 
{ 
    //this does something with the row selected 
    [self handlePickerDidFinish:[[self.dataSource objectAtIndex:(row % self.dataSource.count)] objectForKey:@"key"]]; 
} 

// Creates the custom view for each cell so the text shows in accordance to the App Style 
-(UIView*) pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view 
{ 
    UILabel* customRowLabel = [[[UILabel alloc] initWithFrame:CGRectMake(0, 0, [pickerView rowSizeForComponent:component].width, [pickerView rowSizeForComponent:component].height)] autorelease]; 

    customRowLabel.font = [UIFont fontWithName:@"HelveticaNeue" size: 16]; 
    customRowLabel.textColor = [UIColor colorWithRed:kColorRed green:kColorGreen blue:kColorBlue alpha:1]; 
    customRowLabel.textAlignment = UITextAlignmentCenter; 
    customRowLabel.backgroundColor = [UIColor clearColor]; 

    customRowLabel.text = [[self.dataSource objectAtIndex:(row % self.dataSource.count)] objectForKey:@"key"]; 

    return customRowLabel; 
} 

#pragma mark - Delegate Protocols 
// Notifies Delegate class that an action has been perfomed and passes the Mood String selected 
-(void)handlePickerDidFinish:(id)item 
{ 
    [self.pickDelegate somePickerFinishedPicking:item]; 
} 

@end 

而只是实例它像这样在你父母的ViewController：

线

CGRect rectPicker = CGRectMake(60, 100, 200, 216); 
self.somePicker = [[[SomePicker alloc] init] autorelease]; 
[self.somePicker setPickDelegate:self]; 
[self.somePicker.view setBackgroundColor:[UIColor clearColor]]; 
self.somePicker.view.frame = rectPicker; 
[self.somePicker.view setTag:777]; 
[self.somePicker.view setAlpha:0]; 
[self.view addSubview:self.somePicker.view]; 

〜/结束