0

Draggable を作成するときUIButton、ドラッグ イベントは正常に機能UIControlEventsしますが、ボタンを単に押してドラッグしないと応答しない理由がわかりません。

ボタンの作成

DraggableButton * camera = [DraggableButton buttonWithType:UIButtonTypeCustom];
[camera setFrame:CGRectMake(160,5,149,40)];
[camera setImage: [UIImage imageWithContentsOfFile:cameraMode] forState:UIControlStateNormal];
[camera setTitle: @"Camera" forState:UIControlStateNormal];  // never gets called.
[camera addTarget:self action:@selector(openCamera) forControlEvents:UIControlEventTouchUpInside];
[buttonView addSubview: camera];

ドラッグ可能なボタン

@interface DraggableButon : UIButton
{
@private float deltaX;
@private float deltaY;
    CGPoint startLocation;
    BOOL    dragging;
}
@end
@implementation DraggableButon
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{
    [super touchesMoved:touches withEvent:event];

    if ( ! draggable ) return;

    dragging = YES;
    camera.enabled = NO;
    flash.enabled = NO;

    // Calculate offset
    CGPoint pt = [[[event allTouches] anyObject] locationInView:buttonView];
    deltaX = pt.x - startLocation.x;
    deltaY = pt.y - startLocation.y;

    float xx;
    if ( IPAD ) { xx = buttonView.center.x + deltaX; } else { xx = 160; }
    CGPoint newcenter = CGPointMake(xx, buttonView.center.y + deltaY);

    // Set new location
    buttonView.center = newcenter;
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{
    [super touchesBegan:touches withEvent:event];

    if ( ! draggable ) return;

    // Calculate and store offset, and pop view into front if needed
    CGPoint pt = [[[event allTouches] anyObject] locationInView:buttonView];
    startLocation = pt;
    [[self superview] bringSubviewToFront:buttonView];
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
{        
    [super touchesEnded:touches withEvent:event];

    dragging = YES;
    if ( dragging )
    {
        camera.enabled = YES;
        flash.enabled = YES;

        //NSLog(@"touchesEnded: buttonView.frame.origin.x: %3.2f, buttonView.frame.origin.y: %3.2f",buttonView.frame.origin.x,buttonView.frame.origin.y);
        rectFromString = [NSString stringWithFormat:@"{{%3.2f,%3.2f},{320,50}}",buttonView.frame.origin.x,buttonView.frame.origin.y]; 
        NSMutableDictionary * dict = [[NSMutableDictionary alloc] initWithContentsOfFile: SETTINGS_FILE];
        [dict setObject:rectFromString forKey:@"kCGRectFromString"];
        [dict writeToFile: SETTINGS_FILE atomically:YES];
    }else{
        [self sendActionsForControlEvents:UIControlEventTouchUpInside];
    }
}
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event 
{    
    [super touchesCancelled:touches withEvent:event];
}
@end
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2 に答える 2

1

タッチ イベントを上書きし、それ以上 に送信しないため、アクションは呼び出されませんsuper。新しい変数を追加できます (それを と呼びましょうdragged)。これを で NO に設定し、でtouchesBegan:YES に設定し、NO コールに設定されている場合は で設定しますtouchesMoved:touchesEnded:[self sendActionsForControlEvents:UIControlEventTouchUpInside];

@interface DraggableButon : UIButton
{
@private float deltaX;
@private float deltaY;
    CGPoint startLocation;
    BOOL    dragging;
}
@end
@implementation DraggableButon
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{
    dragging=NO;

    if ( ! draggable ) return;

    // Calculate and store offset, and pop view into front if needed
    CGPoint pt = [[[event allTouches] anyObject] locationInView:buttonView];
    startLocation = pt;
    [[self superview] bringSubviewToFront:buttonView];
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{
    dragging=YES;

    if ( ! draggable ) return;

    camera.enabled = NO;
    flash.enabled = NO;

    // Calculate offset
    CGPoint pt = [[[event allTouches] anyObject] locationInView:buttonView];
    deltaX = pt.x - startLocation.x;
    deltaY = pt.y - startLocation.y;

    float xx;
    if ( IPAD ) { xx = buttonView.center.x + deltaX; } else { xx = 160; }
    CGPoint newcenter = CGPointMake(xx, buttonView.center.y + deltaY);

    // Set new location
    buttonView.center = newcenter;
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
{        
    if(!dragging){  // or if(!dragging||!draggable)
        [self sendActionsForControlEvents:UIControlEventTouchUpInside];
        return;
    }

    camera.enabled = YES;
    flash.enabled = YES;

    //NSLog(@"touchesEnded: buttonView.frame.origin.x: %3.2f, buttonView.frame.origin.y: %3.2f",buttonView.frame.origin.x,buttonView.frame.origin.y);
    rectFromString = [NSString stringWithFormat:@"{{%3.2f,%3.2f},{320,50}}",buttonView.frame.origin.x,buttonView.frame.origin.y]; 
    NSMutableDictionary * dict = [[NSMutableDictionary alloc] initWithContentsOfFile: SETTINGS_FILE];
    [dict setObject:rectFromString forKey:@"kCGRectFromString"];
    [dict writeToFile: SETTINGS_FILE atomically:YES];
}
@end
于 2011-09-18T09:46:17.717 に答える
0

デバッグして、タッチ イベント関数が呼び出されるかどうかを確認しましたか? そして、単純な押されたアクションはで実装する必要がありますtouchesEnded: withEvent:

から継承されているのでUIButton、直接のようにアクションイベントを追加しようとしましたaddTarget: action: forControlEvents:か?

于 2011-09-18T08:15:01.380 に答える