hitTest:方法練習 - 不規則區域點選事件處理

1.

2.自定義Button

//
//  PopBtn.m


#import "PopBtn.h"

@implementation PopBtn

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
    
    // 目前控件上的點轉換到chatView上
    CGPoint chatP = [self convertPoint:point toView:self.chatView];
    
    // 判斷下點在不在chatView上
    if ([self.chatView pointInside:chatP withEvent:event]) {
        return self.chatView;
    }else{
        return [super hitTest:point withEvent:event];
    }
    
    
    
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    // 擷取UITouch
    UITouch *touch = [touches anyObject];
    
    // 擷取目前的點
    CGPoint curP = [touch locationInView:self];
    
    // 擷取上一個的點
    CGPoint preP = [touch previousLocationInView:self];
    
    // 擷取偏移量
    CGFloat offsetX = curP.x - preP.x;
    CGFloat OffsetY = curP.y - preP.y;
    
    // 修改控件的位置
    CGPoint center = self.center;
    center.x += offsetX;
    center.y += OffsetY;
    
    self.center = center;
    
}
@end
           

3.點選按鈕，彈出

#import "ViewController.h"
#import "PopBtn.h"

@interface ViewController ()

@end

@implementation ViewController
- (IBAction)popChatView:(PopBtn *)sender {
    // 彈出對話框
    UIButton *chatView = [UIButton buttonWithType:UIButtonTypeCustom];
    
    chatView.bounds = CGRectMake(0, 0, 200, 200);
    chatView.center = CGPointMake(100, -100);
    
    [chatView setBackgroundImage:[UIImage imageNamed:@"對話框"] forState:UIControlStateNormal];
    [chatView setBackgroundImage:[UIImage imageNamed:@"小孩"] forState:UIControlStateHighlighted];
    sender.chatView = chatView;
    [sender addSubview:chatView];
    
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}


@end
           

示範：