Objective c 通过触摸移动多个对象
我有一个应用程序,你必须用触摸来移动不同的字母(以Objective c 通过触摸移动多个对象,objective-c,ios,touch,uilabel,Objective C,Ios,Touch,Uilabel,我有一个应用程序,你必须用触摸来移动不同的字母(以ui标签的形式)。由于存在许多不同的UILabel对象,因此我尝试创建此代码,以防止任何标签粘在一起: - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [[event allTouches] anyObject]; CGPoint touchPoint = [touch locationInView: self.view];
ui标签的形式)。由于存在许多不同的UILabel
对象,因此我尝试创建此代码,以防止任何标签粘在一起:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchPoint = [touch locationInView: self.view];
bool pickup = YES;
if (pickup) {
if (CGRectContainsPoint(a.frame, touchPoint)) {
a.center = touchPoint;
pickup = NO;
}
}
if (pickup) {
if (CGRectContainsPoint(x.frame, touchPoint)) {
x.center = touchPoint;
pickup = NO;
}
}
if (pickup) {
if (CGRectContainsPoint(x2.frame, touchPoint)) {
x2.center = touchPoint;
pickup = NO;
}
}
if (pickup) {
if (CGRectContainsPoint(eq.frame, touchPoint)) {
eq.center = touchPoint;
pickup = NO;
}
}
if (pickup) {
if (CGRectContainsPoint(b.frame, touchPoint)) {
b.center = touchPoint;
pickup = NO;
}
}
}
但这里有一些问题:
移动不是平滑的,一旦我的手指移动了图像,标签就会停止移动(显然是因为if(CGRectContainsPoint(a.frame,touchPoint))
而且一旦我在移动另一个标签时绕过了一个标签,我的手指就会开始移动我绕过的标签
我知道有一种比我现在做的更好的方法,我该怎么做…试着把所有的东西都放在一个链接动画中touchMoved
是老派的。在每个标签上添加一个手势识别器。然后在该选择器中尝试-
- (void)labelTouchSelector:(UIGestureRecognizer *)gesture
{
CGPoint touchPoint = [gesture locationInView: self.view];
[UIView animateWithDuration:1.0
delay:0
options:UIViewAnimationOptionCurveLinear | UIViewAnimationOptionAllowUserInteraction
animations:^(void)
{
if(CGRectContainsPoint(a.frame, touchPoint))
{
a.center = touchPoint;
pickup = NO;
}
}
completion:^(BOOL finished)
{
if(finished)
{
//do some cleanup here
pickup = NO;
}
}];
return;
}
我将尝试创建一个新的UILabel类,该类将实现touchesBegind、touchesMoved和toucheSend。将相关代码放入每个方法中。为此类创建一个方法,为成员分配字母值。在ViewController中实例化该类的每个新对象,并在此处设置其字母以及其他必要的参数详细信息,如label.center。我希望这有帮助
我的代码中的示例(使用UIImage,您需要找到一种使用UILabel初始化类的方法,但是标准方法会这样做):
嗯…我什么时候调用这个方法,而且,你不能在一个块中分配拾取…在你的手势识别器中添加这个方法作为选择器,你分配给每个UILabel。嗯…我必须收回它不幸的是…我留下了我的旧代码,所以我认为它可以工作。什么都没有发生。。。
@implementation myClass
- (id)initWithImage:(UIImage *)image
{
if (self = [super initWithImage:image])
self.userInteractionEnabled = YES;
return self;
}
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch * touch = [touches anyObject];
pos = [touch locationInView: self];
self.center = pos;
NSLog(@"Touches Began Called.");
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
activePoint = [[touches anyObject] locationInView:self];
int dx = self.center.x + (activePoint.x - pos.x);
int dy = self.center.y + (activePoint.y - pos.y);
CGPoint newPoint = CGPointMake(dx,dy);
self.center = newPoint;
NSLog(@"Touches Moved Called.");
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
NSLog(@"Touches Ended Called.");
}