#import "ViewController.h"

#import "SDmoreCircle.h"

@interface ViewController ()

 

@end

 

@implementation ViewController

 

- (void)viewDidLoad {

    [super viewDidLoad];

//    背景色

    self.view.backgroundColor=[UIColor lightGrayColor];

    

    [self.view addSubview:[SDmoreCircle ViewWithCircle:self.view.frame]];

    

}

 

 

#import <UIKit/UIKit.h>

 

@interface SDmoreCircle : UIView

//

+(instancetype)ViewWithCircle:(CGRect)rect;

-(instancetype)initWithFrame:(CGRect)frame;

@end

#import "SDmoreCircle.h"

 

@implementation SDmoreCircle

 

+(instancetype)ViewWithCircle:(CGRect)rect

{

    return [[self alloc]initWithFrame:rect];

}

-(instancetype)initWithFrame:(CGRect)frame

{

    return [super initWithFrame:frame];

}

-(void)creatCircle:(NSSet *)touches

{

    UITouch *touch=[touches anyObject];

    CGPoint point=[touch locationInView:self];

    

    CALayer *layer=[CALayer layer];

    layer.frame=CGRectMake(point.x-1, point.y-1, 10, 10);

    layer.borderColor=[UIColor colorWithRed:arc4random()%255/256.0 green:arc4random()%255/255.0 blue:arc4random()%255/255.0 alpha:1.0].CGColor;

    layer.borderWidth=0.5;

    layer.cornerRadius=5;

    [self setAnimation:layer];

    [self.layer addSublayer:layer];

}

 

-(void)setAnimation:(CALayer *)layer

{

    const int max = 20;

    if (layer.transform.m11<max) {

        [layer setTransform:CATransform3DScale(layer.transform, 1.1, 1.1, 1.0)];

//        其实说的就是_cmd在Objective-C的方法中表示当前方法的selector,正如同self表示当前方法调用的对象实例一样。

        [self performSelector:_cmd withObject:layer afterDelay:0.03];

    }

    else

    {

        [layer removeFromSuperlayer];

    }

}

 

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event

{

    [self creatCircle:touches];

}

-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event

{

    [self creatCircle:touches];

}

@end