本文介绍了在动画制作动画时更新视图的帧的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在做这样的动画:
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
animation.duration = 100.0;
animation.path = self.animationPath.CGPath;
[view.layer addAnimation:animation forKey:@"animation"];
工作正常,但是,当尝试检测正在移动的对象上的触摸时,这现在失败了屏幕:
Works fine, however, this now fails when trying to detect touches on the object that is moving around the screen:
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
for (UIView* subview in self.subviews ) {
if ( [subview hitTest:[self convertPoint:point toView:subview] withEvent:event] != nil ) {
[self handleTap];
return YES;
}
}
return NO;
}
它失败了,因为视图的框架不再与它的明显位置相同动画时的屏幕。如何使用 pointInside
来处理正在设置动画的视图?
It fails because the view's frame is no longer the same as it's apparent position on the screen when it is being animated. How can I get pointInside
to work with a view that is being animated?
推荐答案
这是我执行此操作的代码
This is my code to do this
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet AnimatableView *animableView;
@end
@implementation ViewController
- (void)animateAlongPath
{
UIBezierPath * path = [UIBezierPath bezierPathWithRect:self.view.frame];
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
animation.duration = 10;
animation.path = path.CGPath;
animation.removedOnCompletion = NO;
animation.fillMode = @"kCAFillModeForwards";
[self.animableView.layer addAnimation:animation forKey:@"animation"];
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)animate:(id)sender {
[self animateAlongPath];
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView: [touch view]];
CALayer * selectedlayer = (CALayer*)[self.animableView.layer.presentationLayer hitTest:location];
if(selectedlayer != nil)
NSLog(@"touched");
else
NSLog(@"dont touched");
}
@end
我希望这有助于你
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