我是 ios 和核心动画的新手，所以我正在做一些测试以适应它。 我有一个菜单，我想通过长按手势来创建。我希望按钮通过向上动画然后向下动画然后消失。我让出现的部分工作了，但我不知道如何让它消失。它还不允许我在我的 UIGestureRecognizerStateEnded 语句中为我的 imageView 设置动画。基本上，我有两个问题:

1. 如何在松开长按时设置按钮向下移动的动画？

2. 如何只制作这些按钮中的一个，而不是每次长按时它们都出现？

这是我的 .m 中的内容

-(void)onPress:(UILongPressGestureRecognizer*)longpress{

CGPoint touchCenter = [longpress locationInView:self.view];

UIImage *plus = [UIImage imageNamed:@"plus"];
imageView = [[UIImageView alloc]initWithImage:plus];

CGRect imageViewFrame = CGRectMake(0, 0, 35, 35);
imageViewFrame.origin = CGPointMake(touchCenter.x - imageViewFrame.size.width / 2.0f, touchCenter.y - imageViewFrame.size.height / 2.0f);
imageView.frame = imageViewFrame;

if (longpress.state == UIGestureRecognizerStateBegan) {
    [self.view addSubview:imageView];

    [UIView animateWithDuration:0.6 animations:^{
        CGAffineTransform moveTrans = CGAffineTransformMakeTranslation(0, -40);
        imageView.transform = moveTrans;
    }];
    NSLog(@"Long press");
    return;
}else{


if (longpress.state == UIGestureRecognizerStateEnded || longpress.state == UIGestureRecognizerStateCancelled || longpress.state == UIGestureRecognizerStateFailed) {

    [UIView animateWithDuration:0.6 animations:^{
        CGAffineTransform moveTrans = CGAffineTransformMakeTranslation(0, 40);
        imageView.transform = moveTrans;
        NSLog(@"long press done");
    }];

}


}

和我的.h

#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>

@interface ViewController : UIViewController<UIGestureRecognizerDelegate>
{
    UIImageView *imageView;
    CAShapeLayer *layer;

}
@property(nonatomic) float angle;
@property(nonatomic, strong) UIImageView *imageView;
@property (nonatomic, strong) UIImage *image;
@end

最佳答案

我现在确定你想做什么。但是我修改了你的一些代码:

@interface ViewController ()
@property (strong, nonatomic) UIView *moveView;
@end

- (void)viewDidLoad
{
    [super viewDidLoad];
    UILongPressGestureRecognizer *recoginzer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(onPress:)];
    [self.view addGestureRecognizer:recoginzer];
}

- (void)onPress:(UILongPressGestureRecognizer*)longpress {
    CGPoint location = [longpress locationInView:self.view];
    if (longpress.state == UIGestureRecognizerStateBegan) {
        if (!self.moveView) {
            self.moveView = [[UIView alloc] initWithFrame:CGRectMake(location.x, location.y, 100, 100)];
            self.moveView.backgroundColor = [UIColor redColor];
            [self.view addSubview:self.moveView];
        } else {
            self.moveView.frame = CGRectMake(location.x, location.y, 100, 100);
        }
        [UIView animateWithDuration:0.6 animations:^{
            CGAffineTransform moveTrans = CGAffineTransformMakeTranslation(0, -40);
            self.moveView.transform = moveTrans;
        }];
        NSLog(@"Long press");
    } else if (longpress.state == UIGestureRecognizerStateEnded || longpress.state == UIGestureRecognizerStateCancelled || longpress.state == UIGestureRecognizerStateFailed) {
            [UIView animateWithDuration:0.6 animations:^{
                CGAffineTransform moveTrans = CGAffineTransformMakeTranslation(0, 40);
                self.moveView.transform = moveTrans;
                NSLog(@"long press done");
            }];
    }
}

如果您需要更多帮助，请告诉我。

关于ios - 长按手势弹出菜单，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21792216/