Question

我正在使用cocos2d开发iPhone 2d游戏。我需要一个选择器。是否可以在cocos2d中使用Picker！如果可能的话告诉我，如何在cocos2d中使用Picker？

Answer 1

是的，您可以将基于标准UIView的类与Cocos2D类混合使用。

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。您还可以在appdelegate中保存对窗口的引用。现在，您可以创建UIViews并将其添加到Window中，并像往常一样通过导向器操作cocos2d节点。

从这里开始，只需创建UIPickerView并将其添加到窗口即可。配置UIPickerView本身就是一项完整任务...... Nitrex88有一个good video on the subject。另外，请查看UICatalog以获取UIPickerView的一个可靠示例，还有更多UIView子类。

以下是将一个简单的UIPicker添加到cocos2d应用程序的示例：

#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

是否可以在cocos2d中使用UIPickerView？

1 个答案: