hitTest练手例子

//
//  RedButton.m
//  Hit实际例子
//
//  Created by Jason on 2019/3/12.
//  Copyright © 2019 友邦创新资讯. All rights reserved.
//

#import "RedButton.h"

@implementation RedButton

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    //获取上一次坐标点
    CGPoint preP = [touch previousLocationInView:self];
    //获取现在坐标
    CGPoint cur = [touch locationInView:self];
    
    CGFloat offsetX = cur.x - preP.x;
    CGFloat offsetY = cur.y - preP.y;
    self.transform = CGAffineTransformTranslate(self.transform, offsetX, offsetY);
}

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    CGPoint blueBtnPoint = [self convertPoint:point toView:self.blueBtn];
    if ([self.blueBtn pointInside:blueBtnPoint withEvent:event]) {
        return self.blueBtn;
    }
    return [super hitTest:point withEvent:event];
}
@end

//
//  ViewController.m
//  Hit实际例子
//
//  Created by Jason on 2019/3/12.
//  Copyright © 2019 友邦创新资讯. All rights reserved.
//

#import "ViewController.h"
#import "RedButton.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}
- (IBAction)clickButton:(RedButton *)sender {
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    [btn setImage:[UIImage imageNamed:@"对话框"] forState:UIControlStateNormal];
    [btn setImage:[UIImage imageNamed:@"小孩"] forState:UIControlStateHighlighted];
    btn.frame = CGRectMake(100, -100, 200, 100);
    sender.blueBtn = btn;
    [sender addSubview:btn];
}


@end