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

最新推荐文章于 2024-05-27 09:58:23 发布

vaercly

最新推荐文章于 2024-05-27 09:58:23 发布

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分类专栏： UI应用文章标签：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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//
//  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