objective-c – keyDown工作,但我发出哔哔声

概述我只是让我的keydown方法工作.但每按一次键,我都会发出哔哔声.我不知道什么是错的.用Google搜索了几个小时,所有人都说如果你有keyDown方法,你也应该实现acceptFirstResponder.这样做,它仍然无法正常工作. #import <Cocoa/Cocoa.h>#import "PaddleView.h"#import "BallView.h"@interface 我只是让我的keydown方法工作.但每按一次键,我都会发出哔哔声.我不知道什么是错的.用Google搜索了几个小时,所有人都说如果你有keyDown方法,你也应该实现acceptFirstResponder.这样做,它仍然无法正常工作.

#import <Cocoa/Cocoa.h>#import "PaddleVIEw.h"#import "BallVIEw.h"@interface GameController : NSVIEw {    PaddleVIEw *leftPaddle;    PaddleVIEw *rightPaddle;    BallVIEw * ball;    CGPoint ballVeLocity;    int gameState;    int player1score;    int player2score;}@property (retain) IBOutlet PaddleVIEw *leftPaddle;@property (retain) IBOutlet PaddleVIEw *rightPaddle;@property (retain) IBOutlet BallVIEw *ball;- (voID)reset:(BOol)newGame;@end

#import "GameController.h"#define GameStateRunning 1#define GameStatePause 2#define BallSpeedX 0.2#define BallSpeedY 0.3#define CompMoveSpeed 15#define scoreToWin 5@implementation GameController@synthesize leftPaddle,rightPaddle,ball;- (ID)initWithCoder:(NSCoder *)aDecoder {    self = [super initWithCoder:aDecoder];      if(self) {              gameState = GameStatePause;        ballVeLocity = CGPointMake(BallSpeedX,BallSpeedY);        [NSTimer scheduledTimerWithTimeInterval:0.001 target:self selector:@selector(gameLoop) userInfo:nil repeats:YES];    }    return self;}- (voID)gameLoop {    if(gameState == GameStateRunning) {        [ball setFrameOrigin:CGPointMake(ball.frame.origin.x + ballVeLocity.x,ball.frame.origin.y + ballVeLocity.y)];        if(ball.frame.origin.x + 15 > self.frame.size.wIDth || ball.frame.origin.x < 0) {            ballVeLocity.x =- ballVeLocity.x;        }        if(ball.frame.origin.y + 35 > self.frame.size.height || ball.frame.origin.y < 0) {            ballVeLocity.y =- ballVeLocity.y;        }    }    if(CGRectIntersectsRect(ball.frame,leftPaddle.frame)) {        if(ball.frame.origin.x > leftPaddle.frame.origin.x) {            ballVeLocity.x =- ballVeLocity.x;        }    }    if(CGRectIntersectsRect(ball.frame,rightPaddle.frame)) {        if(ball.frame.origin.x +15 > rightPaddle.frame.origin.x) {            ballVeLocity.x =- ballVeLocity.x;        }    }    if(ball.frame.origin.x <= self.frame.size.wIDth / 2) {        if(ball.frame.origin.y < leftPaddle.frame.origin.y + 75 && leftPaddle.frame.origin.y > 0) {            [leftPaddle setFrameOrigin:CGPointMake(leftPaddle.frame.origin.x,leftPaddle.frame.origin.y - CompMoveSpeed)];        }        if(ball.frame.origin.y > leftPaddle.frame.origin.y +75 && leftPaddle.frame.origin.y < 700 - leftPaddle.frame.size.height ) {            [leftPaddle setFrameOrigin:CGPointMake(leftPaddle.frame.origin.x,leftPaddle.frame.origin.y + CompMoveSpeed)];        }    }    if(ball.frame.origin.x <= 0) {        player2score++;        [self reset:(player2score >= scoreToWin)];    }    if(ball.frame.origin.x + 15 > self.frame.size.wIDth) {        player1score++;        [self reset:(player1score >= scoreToWin)];    }}- (voID)reset:(BOol)newGame {    gameState = GameStatePause;    [ball setFrameOrigin:CGPointMake((self.frame.size.wIDth + 7.5) / 2,(self.frame.size.height + 7.5)/2)];    if(newGame) {        if(player1score > player2score) {            NSLog(@"Player 1 Wins!");        }        else {            NSLog(@"Player 2 Wins!");        }        player1score = 0;        player2score = 0;    }    else {        NSLog(@"Press key to serve");    }    NSLog(@"Player 1: %d",player1score);    NSLog(@"Player 2: %d",player2score);}- (voID)moveRightPaddleUp {    if(rightPaddle.frame.origin.y < 700 - rightPaddle.frame.size.height) {        [rightPaddle setFrameOrigin:CGPointMake(rightPaddle.frame.origin.x,rightPaddle.frame.origin.y + 20)];    }}- (voID)moveRightPaddleDown {    if(rightPaddle.frame.origin.y > 0) {        [rightPaddle setFrameOrigin:CGPointMake(rightPaddle.frame.origin.x,rightPaddle.frame.origin.y - 20)];    }}- (BOol)acceptsFirstResponder {    return YES;}- (voID)keyDown:(NSEvent *)theEvent {    if ([theEvent modifIErFlags] & NSNumericPadKeyMask) {        Nsstring *theArrow = [theEvent charactersIgnoringModifIErs];        unichar keyChar = 0;        if ( [theArrow length] == 0 ) {            return;            // reject dead keys        }        if ( [theArrow length] == 1 ) {            keyChar = [theArrow characteratIndex:0];            if ( keyChar == NSleftArrowFunctionKey ) {                gameState = GameStateRunning;            }            if ( keyChar == NSRightArrowFunctionKey ) {            }            if ( keyChar == NSUpArrowFunctionKey ) {                [self moveRightPaddleUp];            }            if ( keyChar == NSDownArrowFunctionKey ) {                [self moveRightPaddleDown];            }            [super keyDown:theEvent];               }    }    else {        [super keyDown:theEvent];    }}- (voID)drawRect:(NSRect)dirtyRect {}- (voID)dealloc {    [ball release];    [rightPaddle release];    [leftPaddle release];    [super dealloc];}@end

解决方法 如果您“消费”该事件,请不要将其传递给super. 总结

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