我正在尝试创建一个 iPhone 钢琴应用程序。我在 Interface Builder 中创建了 14 个不同的 UIImageViews 来表示键。使用 touchesBegan、touchesMoved、touchesEnded 和 touchesCancelled 然后我尝试播放音频文件。
因此,当您移动手指(touchesMoved)时播放声音后,我已经使用 NSMutableArray 解决了。
代码(我只复制了 C 键,其他键的代码相同)如下所示:
我的 .h 文件:
@interface PianoViewController : UIViewController {
IBOutlet UIImageView *pianoButtonC;
IBOutlet UIImageView *pianoButtonCC;
IBOutlet UIImageView *pianoButtonD;
IBOutlet UIImageView *pianoButtonDb;
IBOutlet UIImageView *pianoButtonDbDb;
IBOutlet UIImageView *pianoButtonE;
IBOutlet UIImageView *pianoButtonEb;
IBOutlet UIImageView *pianoButtonF;
IBOutlet UIImageView *pianoButtonG;
IBOutlet UIImageView *pianoButtonGb;
IBOutlet UIImageView *pianoButtonH;
IBOutlet UIImageView *pianoButtonHb;
CGPoint location;
NSMutableArray *lastButtons;
UITouch *touch;
}
@end
我的 .m 文件:
#import "PianoViewController.h"
@implementation PianoViewController
-(void)viewDidLoad {
[super viewDidLoad];
[self.view setMultipleTouchEnabled:YES];
lastButtons = [[NSMutableArray alloc] init];
[lastButtons insertObject:@"notPressedC" atIndex:0];
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
for(touch in [event allTouches]){
if(CGRectContainsPoint(pianoButtonC.frame, [touch locationInView:touch.view]) && [lastButtons containsObject:@"notPressedC"]) {
[pianoButtonC setHighlighted: YES];
NSString *path = [[NSBundle mainBundle] pathForResource:@"pianoC"ofType:@"wav"];
SystemSoundID soundID;
AudioServicesCreateSystemSoundID((CFURLRef) [NSURL fileURLWithPath:path], &soundID);
AudioServicesPlaySystemSound (soundID);
[lastButtons replaceObjectAtIndex:0 withObject:@"pressedC"];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
for(touch in [event allTouches]){
if(CGRectContainsPoint(pianoButtonC.frame, [touch locationInView:touch.view]) && [lastButtons containsObject:@"notPressedC"]) {
[pianoButtonC setHighlighted: YES];
NSString *path = [[NSBundle mainBundle] pathForResource:@"pianoC"ofType:@"wav"];
SystemSoundID soundID;
AudioServicesCreateSystemSoundID((CFURLRef) [NSURL fileURLWithPath:path], &soundID);
AudioServicesPlaySystemSound (soundID);
[lastButtons replaceObjectAtIndex:0 withObject:@"pressedC"];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[lastButtons replaceObjectAtIndex:0 withObject:@"notPressedC"];
[pianoButtonC setHighlighted: NO];
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
[self touchesEnded:touches withEvent:event];
}
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationLandscapeRight
);
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
[lastButtons release];
}
@end
(我将用 OpenAL 或其他东西替换“AudioServicesPlaySystemSound”)
现在我的问题:
如果您在没有抬起手指的情况下将手指移动到另一个键,则会播放声音,但该键仍然突出显示。此外,如果您再次向后移动手指,则不会播放任何声音。
另外,两根手指按的时候也有问题,拿走一根。然后再次播放第一个键的音调。
当您按下其中一个黑键时,您也会听到声音,也会听到相邻白键之一的声音。
总的来说,我使用这种方法来创建钢琴 UI 有很多我无法单独解决的问题。
是否有另一种方式来编写整个应用程序?或者有任何关于我如何解决问题的提示吗?
谢谢乔乔斯。
PS:对不起英语不好,我是德国人。