创建可拖动 UIButton
时,拖动事件可以正常工作,但是,我无法弄清楚当按钮为UIControlEvents
时没有响应的原因只是按下而不是拖动。
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];
@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
答案 0 :(得分:1)
因为您覆盖触摸事件而未将其发送到super
,因此未调用该操作。您可以添加一个新变量(让我们称之为dragged
)。在touchesBegan:
将其设置为“否”,将touchesMoved:
设为“是”,将设置为“touchesEnded:
”设置为“否”{<1}}
[self sendActionsForControlEvents:UIControlEventTouchUpInside];
答案 1 :(得分:0)
您是否已调试以及是否调用了触摸事件功能?
简单的按下操作应该在touchesEnded: withEvent:
由于它是从UIButton
继承的,您是否尝试过像addTarget: action: forControlEvents:
那样直接添加操作事件?