Cocos2dを使って2DiPhoneゲームを開発しています。カウントダウンタイマーが必要です。 cocos2dでカウントダウンタイマーを作成するにはどうすればよいですか?
トムを賛成するのに十分な担当者ではありませんが、彼は絶対に正しいです。この質問の文脈では、NSTimerは間違った解決策です。 Cocos2dフレームワークは、一時停止/再開などの他のゲーム機能と統合するスケジューラーを提供します(そして、おそらく内部でNSTimerを使用します)。
上記のリンクの例:
-(id) init
{
if( ! [super init] )
return nil;
// schedule timer
[self schedule: @selector(tick:)];
[self schedule: @selector(tick2:) interval:0.5];
return self;
}
-(void) tick: (CCTime) dt
{
// bla bla bla
}
-(void) tick2: (CCTime) dt
{
// bla bla bla
}
http://www.cocos2d-iphone.org/wiki/doku.php/prog_guide:best_practices
- [〜#〜] not [〜#〜]を試して、CocoaのNSTimerを使用してください。代わりに、cocos2d独自のスケジューラーを使用してください。
- Cocos2dスケジューラーを使用する場合、次のようになります。
- 自動一時停止/再開。
- レイヤー(Scene、Sprite、CocosNode)がステージに入ると、タイマーは自動的にアクティブになり、ステージを出ると、タイマーは自動的に非アクティブになります。
- ターゲット/セレクターはデルタ時間で呼び出されます...
Cocos 2dには、タイマーのデフォルトの更新セクションがあります。
これを試して:
[self schedule:@selector(update:)];
- (void)update:(ccTime)dt {
}
「schedule」メソッドの代わりにNSTimerを使用したい場合は、次のようなクラスを作成できます。
ZIMCountdownTicker.h
#import <Foundation/Foundation.h>
extern NSString * const ZIMCountdownTickerTickAction;
extern NSString * const ZIMCountdownTickerResetAction;
@protocol ZIMCountdownTickerProtocol;
/*!
@class ZIMCountdownTicker
@discussion This class creates a countdown ticker.
@updated 2011-03-05
*/
@interface ZIMCountdownTicker : NSObject {
@private
NSTimer *_timer;
id<ZIMCountdownTickerProtocol> _delegate;
NSTimeInterval _interval;
double _period;
double _value;
}
/*!
@method initWithDelegate:withTimeInterval:forTimePeriod:
@discussion This method instantiate an instance of this class with the specified parameters.
@param delegate A reference to a class that has implemented ZIMCountdownTickerProtocol.
@param interval The time interval in seconds to be used when running the countdown ticker.
@param period The time period in seconds for which countdown ticker will run.
@updated 2011-03-05
*/
- (id) initWithDelegate: (id<ZIMCountdownTickerProtocol>)delegate withTimeInterval: (NSTimeInterval)interval forTimePeriod: (double)period;
/*!
@method start
@discussion This method will start the countdown ticker.
@updated 2011-03-05
*/
- (void) start;
/*!
@method stop
@discussion This method will stop the countdown ticker.
@updated 2011-03-05
*/
- (void) stop;
/*!
@method reset
@discussion This method will reset the countdown ticker.
@updated 2011-03-06
*/
- (void) reset;
/*!
@method value
@discussion This method will return the countdown ticker's current value; however, using this method will cause
the ticker to stop.
@return The countdown ticker's current value.
@updated 2011-03-05
*/
- (double) value;
@end
@protocol ZIMCountdownTickerProtocol <NSObject>
@optional
/*!
@method countdownTicker:didUpdateValue:withAction:
@discussion This method will notify the delegate with the current value.
@param ticker A reference to tiggering ticker.
@param value The current value.
@param action The action that tiggered this method.
@updated 2011-03-05
*/
- (void) countdownTicker: (ZIMCountdownTicker *)ticker didUpdateValue: (double)value withAction: (NSString *)action;
/*!
@method countdownTickerDidFinish:
@discussion This method will notify the delegate that the countdown ticker finished.
@param ticker A reference to tiggering ticker.
@updated 2011-03-05
*/
- (void) countdownTickerDidFinish: (ZIMCountdownTicker *)ticker;
@end
ZIMCountdownTicker.m
// Ziminji Classes
#import "ZIMCountdownTicker.h"
NSString * const ZIMCountdownTickerTickAction = @"ticker.tick";
NSString * const ZIMCountdownTickerResetAction = @"ticker.reset";
/*!
@category ZIMCountdownTicker (Private)
@discussion This category defines the prototypes for this class's private methods.
@updated 2011-03-05
*/
@interface ZIMCountdownTicker (Private)
/*!
@method countdown:
@discussion This method is called by the timer to decrement the counter's value and will send
the delegate the updated value.
@param timer The timer currently in use.
@updated 2011-03-06
*/
- (void) countdown: (NSTimer *)timer;
@end
@implementation ZIMCountdownTicker
- (id) initWithDelegate: (id<ZIMCountdownTickerProtocol>)delegate withTimeInterval (NSTimeInterval)interval forTimePeriod: (double)period {
if (self = [super init]) {
_delegate = delegate;
_interval = interval;
_period = period;
_value = period;
_timer = nil;
}
return self;
}
- (void) start {
if (_timer == nil) {
_timer = [NSTimer scheduledTimerWithTimeInterval: _interval target: self selector: @selector(countdown:) userInfo: nil repeats: YES];
}
}
- (void) stop {
if (_timer != nil) {
[_timer invalidate];
_timer = nil;
}
}
- (void) reset {
[self stop];
_value = _period;
if ((_delegate != nil) && [_delegate respondsToSelector: @selector(countdownTicker:didUpdateValue:withAction:)]) {
[_delegate countdownTicker: self didUpdateValue: _value withAction: ZIMCountdownTickerResetAction];
}
}
- (double) value {
[self stop];
return _value;
}
- (void) countdown: (NSTimer *)timer {
_value -= 1;
if ((_delegate != nil) && [_delegate respondsToSelector: @selector(countdownTicker:didUpdateValue:withAction:)]) {
[_delegate countdownTicker: self didUpdateValue: _value withAction: ZIMCountdownTickerTickAction];
}
if (_value <= 0) {
[self stop];
if ((_delegate != nil) && [_delegate respondsToSelector: @selector(countdownTickerDidFinish:)]) {
[_delegate countdownTickerDidFinish: self];
}
}
}
- (void) dealloc {
if (_delegate != nil) {
[_delegate release];
}
if (_timer != nil) {
[_timer invalidate];
}
[super dealloc];
}
@end