是否可以在cocos2d中使用UIPickerView？

Question

我正在使用cocos2d开发iPhone 2d游戏。我需要一个Picker。是否有可能在cocos2d中使用Picker！如果可能的话告诉我，我如何在cocos2d中使用Picker？

Answer 1

是的，你可以混合使用标准的基于UIView的类和Cocos2D类。

在您的应用程序委托中，当您启动Director时，您创建了一个UIWindow并将Director附加到它上面。您也可以在appdelegate中保存对该窗口的引用。现在，您可以创建UIView并将其添加到窗口中，并像平常一样通过导演操纵cocos2d节点。

从这里，它只是创建一个UIPickerView，并将其添加到窗口的问题。配置UIPickerView本身就是一个完整的任务... Nitrex88有一个good video on the subject。此外，请查看UICatalog以获取不仅是UIPickerView的实例，还有许多更多的UIView子类。

下面是添加琐碎UIPicker到的cocos2d应用程序的例子：

#import <Foundation/Foundation.h> 
#import <UIKit/UIKit.h> 
#import "cocos2d.h" 

@interface AppDelegate { 
    UIWindow *window; 
    NSArray *pickerValues; 
} 
@property (nonatomic, retain) UIWindow window; 
@property (nonatomic, retain) NSArray *pickerValues; 
@end 


@implementation AppDelegate 
@synthesize window, pickerValues; 

-(void)applicationDidFinishLaunching:(UIApplication *)application { 

    // Create Window 
    window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
    [window setUserInteractionEnabled:YES]; 
    [window setMultipleTouchEnabled:YES]; 

    // Set up Director and attach to window 
    [[Director sharedDirector] attachInWindow:window]; 
    [[Director sharedDirector] setLandscape:YES]; 
    [[Director sharedDirector] runWithScene:[MyScene node]]; 

    // Create one large view and rotate the coordinates to landscape 
    UIView *parentView = [[UIView alloc] initWithFrame:CGRectMake(0.0f,0.0f,480.0f, 320.0f)]; 
    parentView.transform = CGAffineTransformIdentity; 
    parentView.transform = CGAffineTransformMakeRotation(degreesToRadian(90)); 
    parentView.bounds = CGRectMake(0.0f, 0.0f, 480.0f, 320.0f); 

    // Initialize picker and its data source 
    pickerValues = [[NSArray alloc] initWithObjects:@"0",@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",nil]; 
    UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0f, 195.0f, 320.0f, 125.0f)]; 
    [pickerView setDelegate:self]; 

    // Attach picker to parent view and parent view to window 
    [parentView addSubview:pickerView]; 
    [window addSubview:parentView]; 
    [window makeKeyAndVisible]; 
} 

- (void) dealloc { 
    [window release]; 
    [pickerValues release]; 
    [super dealloc]; 
} 

// ==================== 
// UIPicker Callbacks 
// ==================== 

// Fire when new picker values are selected 
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component { 
    NSString *numberSequence = [NSString stringWithFormat:@"Sequence: %@%@%@", 
           [pickerValues objectAtIndex:[thePickerView selectedRowInComponent:0]], 
           [pickerValues objectAtIndex:[thePickerView selectedRowInComponent:1]], 
           [pickerValues objectAtIndex:[thePickerView selectedRowInComponent:2]]]; 

    NSLog(numberSequence); 
} 


// Number of picker wheels in the picker 
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView       { 
    return 3; 
} 

// Number of items in each picker wheel 
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component { 
    return [pickerValues count]; 
} 


// Title for Row # 
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { 
    return [pickerValues objectAtIndex:row]; 
} 


// Row height in pixels 
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component { 
    return 40.0; 
} 

// Column width in pixels 
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component { 
    return 90.0f; 
} 
// ==================== 

@end