CAKeyframeAnimation

让父控件上的 图片等view 跟着画出的路线移动

#import "aaDrawView.h"


@interface aaDrawView ()

@property (nonatomic ,retain) UIBezierPath *path;
@end

@implementation aaDrawView

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    
    CGPoint cup = [touch locationInView:self];
    
    UIBezierPath *path = [UIBezierPath bezierPath];
    
    _path = path;
    
    [path moveToPoint:cup];
}
- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    
    CGPoint cup = [touch locationInView:self];
    
    [_path addLineToPoint:cup];
    
    [self setNeedsDisplay];
}
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];
    
    anim.keyPath = @"position";
    
    anim.path = _path.CGPath;
    
    anim.duration = 2;
    
    anim.removedOnCompletion = NO;
    
    anim.fillMode = kCAFillModeForwards;
    
    [[[self.subviews firstObject] layer] addAnimation:anim forKey:nil];
    
    
    
}
- (void)drawRect:(CGRect)rect
{
    [_path stroke];
}

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