捏合视图变化(视图的缩放), 单击随着鼠标移动, 双击放大视图,再双击还原视图

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原创最新推荐文章于 2026-08-26 13:38:43 发布 935 阅读 AI 写同款· GEO 优化 ›

IOS自定义图片浏览器，支持浏览多张图片，点击，双击，两手指缩放操作，并显示加载进度条图片浏览器Controller的主要思路是：新建一个 JZAlbumViewController，在这个controller里主要显示一个UIScrollView，这个UIScrollView用来显示左右的图片，根据传入的图片数组imgArr来设置 contentSize self.scrollView.contentSize = CGSizeMake(self.imgArr.coun 阅读详情

//
//  CLView.m
//  Homework_UIEvent
//
//  Created by lanouhn on 14-8-26.
//  Copyright (c) 2014年 vaercly@163.com 陈聪雷. All rights reserved.
//

#import "CLView.h"

@interface CLView ()
//{
//    CGPoint _firstPreviousLocation;
//    CGPoint _secondPreviousLocation;
//}
@end

@implementation CLView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        self.multipleTouchEnabled = YES;
    }
    return self;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{

    static int i = 1;
    //双击放大, 再次双击恢复
    if (1 == touches.count && 2 == [[touches anyObject] tapCount]) {
        if (1 == i % 2) {
            self.bounds = CGRectMake(0, 0, self.bounds.size.width * 3.0, self.bounds.size.height * 3.0);
        } else {
            self.bounds = CGRectMake(0, 0, self.bounds.size.width / 3.0, self.bounds.size.height / 3.0);
        }
        i++;
    }
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    //获取两个点移动之后的位置
    NSArray *allTouches = [touches allObjects];
    UITouch *firstTouch = [allTouches firstObject];
    UITouch *secondTouch = [allTouches lastObject];
    
    //获取两个手指之前的位置
    CGPoint firstPreviousLocation = [firstTouch previousLocationInView:self];
    CGPoint secondPreviousLocation = [secondTouch previousLocationInView:self];
    //获取两个手指当前位置
    CGPoint firstCurrentLocation = [firstTouch locationInView:self];
    CGPoint secondCurrentLocation = [secondTouch locationInView:self];
    
    //若只有一个手指触摸屏幕并移动时, view同样移动
    if (1 == [touches count]) {
        self.center = CGPointMake(self.center.x + firstCurrentLocation.x - firstPreviousLocation.x, self.center.y + firstCurrentLocation.y - firstPreviousLocation.y);
        return;
    }
    
    
    //获取之前两个点的距离
    CGFloat previousDistance = [self distanceOfPoint1:firstPreviousLocation point2:secondPreviousLocation];
    //获取当前两个点的距离
    CGFloat currentDistance = [self distanceOfPoint1:firstCurrentLocation point2:secondCurrentLocation];
    
//    NSLog(@"%g", previousDistance);
    //求变化的比例
    CGFloat scale = currentDistance / previousDistance;
    //修改视图的大小, 按比例缩放
    self.bounds = CGRectMake(0, 0, self.bounds.size.width * scale, self.bounds.size.height * scale);
    
}

//计算两个点的距离
- (CGFloat)distanceOfPoint1:(CGPoint)point1 point2:(CGPoint)point2
{
    CGFloat dx = point1.x - point2.x;
    CGFloat dy = point1.y - point2.y;
    return sqrt(pow(dx, 2) + pow(dy, 2));
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/

@end

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