图片拖动4边剪切的

//
// CliperView.m
// newPictureShearTool
//
// Created by mini on 2017/1/3.
// Copyright © 2017年 mini. All rights reserved.
//

import "CliperView.h"

@interface CliperView ()

@property(assign,nonatomic) CGRect cliprect;

@property(assign,nonatomic) CGPoint touchPoint;

@property(strong,nonatomic) UIImageView *imageView;

@property(assign,nonatomic) CGColorRef grayAlpha;
@end

@implementation CliperView

  • (id)initWithFrame:(CGRect)frame
    {
    self = [super initWithFrame:frame];
    return self;
    }
  • (id)initWithImageView:(UIImageView*)iv
    {
    CGRect r = [iv bounds];
    self = [super initWithFrame:r];
    if (self) {
    [iv addSubview:self];
    [iv setUserInteractionEnabled:YES];
    [self setBackgroundColor:[UIColor clearColor]];
    //保证出来的是正方形
    float size = r.size.height>r.size.width? r.size.width :r.size.height;
    // 剪切框的位置
    _cliprect = CGRectMake((r.size.width-size)/2, (r.size.height-size)/2, size, size);
    _grayAlpha = [[[UIColor alloc]initWithRed:0 green:0 blue:0 alpha:0.6] CGColor];
    // 只接受单点触摸
    [self setMultipleTouchEnabled:NO];
    _touchPoint = CGPointZero;
    _imageView = iv;
    }
    return self;
    }

/**/
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.

  • (void)drawRect:(CGRect)rect
    {
    CGContextRef context=UIGraphicsGetCurrentContext();
    //绘制剪裁区域外半透明效果
    CGContextSetFillColorWithColor(context, [UIColor orangeColor].CGColor);

      CGRect r = CGRectMake(0, 0, rect.size.width, _cliprect.origin.y);
  CGContextFillRect(context, r);
  r = CGRectMake(0, _cliprect.origin.y-0.2, _cliprect.origin.x, _cliprect.size.height);
  CGContextFillRect(context, r);
  r = CGRectMake(_cliprect.origin.x + _cliprect.size.width, _cliprect.origin.y-0.2, rect.size.width - _cliprect.origin.x - _cliprect.size.width, _cliprect.size.height);
  CGContextFillRect(context, r);
  r = CGRectMake(0, _cliprect.origin.y + _cliprect.size.height, rect.size.width, rect.size.height - _cliprect.origin.y - _cliprect.size.height+0.1);
  CGContextFillRect(context, r);
          //绘制剪裁区域的格子
  CGContextSetRGBStrokeColor(context, 1.0f, 1.0f, 1.0f, 0.8f);
  CGContextSetLineWidth(context, 2.0);
  CGContextAddRect(context, _cliprect);
  CGContextMoveToPoint(context, _cliprect.origin.x+_cliprect.size.width/3, _cliprect.origin.y);
  CGContextAddLineToPoint(context, _cliprect.origin.x+_cliprect.size.width/3, _cliprect.origin.y+_cliprect.size.height);
  CGContextMoveToPoint(context, _cliprect.origin.x+_cliprect.size.width/3*2, _cliprect.origin.y);
  CGContextAddLineToPoint(context, _cliprect.origin.x+_cliprect.size.width/3*2, _cliprect.origin.y+_cliprect.size.height);
          //
  CGContextMoveToPoint(context, _cliprect.origin.x, _cliprect.origin.y+_cliprect.size.height/3);
  CGContextAddLineToPoint(context, _cliprect.origin.x+_cliprect.size.width, _cliprect.origin.y+_cliprect.size.height/3);
  CGContextMoveToPoint(context, _cliprect.origin.x, _cliprect.origin.y+_cliprect.size.height/3*2);
  CGContextAddLineToPoint(context, _cliprect.origin.x+_cliprect.size.width, _cliprect.origin.y+_cliprect.size.height/3*2);
  CGContextStrokePath(context);

}

  • (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
    {
    UITouch *touch = [touches anyObject];
    // 记录点击的起点
    _touchPoint = [touch locationInView:self];
    }

  • (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
    {
    UITouch *touch = [touches anyObject];
    CGPoint p = [touch locationInView:self];
    float x1=.0f, x2=.0f, y1=.0f, y2=.0f;
    float x = _touchPoint.x;
    float y = _touchPoint.y;
    if (fabs(x-_cliprect.origin.x)<20) //左
    {
    float offy = y-_cliprect.origin.y;
    if (fabsf(offy)<20) { //左上角
    x1 = p.x - _touchPoint.x;
    y1 = p.y - _touchPoint.y;
    }else if(fabs(offy-_cliprect.size.height)<20){ //左下角
    x1 = p.x - _touchPoint.x;
    y2 = p.y - _touchPoint.y;
    }else if(y>_cliprect.origin.y && y<_cliprect.origin.y+_cliprect.size.height) { //左中部
    x1 = p.x - _touchPoint.x;
    }
    }else if(fabs(x-_cliprect.origin.x-_cliprect.size.width)<20) //右
    {
    float offy = y-_cliprect.origin.y;
    if (fabsf(offy)<20) { //右上角
    x2 = p.x -_touchPoint.x;
    y1 = p.y -_touchPoint.y;
    }else if(fabs(offy-_cliprect.size.height)<20) { //右下角
    x2 = p.x - _touchPoint.x;
    y2 = p.y - _touchPoint.y;
    }else if(y>_cliprect.origin.y && y<_cliprect.origin.y+_cliprect.size.height) { //右中部
    x2 = p.x - _touchPoint.x;
    }
    }else if(fabs(y-_cliprect.origin.y)<20){ //上
    if (x>_cliprect.origin.x && x< _cliprect.size.width) { //上中
    y1 = p.y - _touchPoint.y;
    }
    }else if(fabs(y-_cliprect.origin.y-_cliprect.size.height)<20){ //下
    if (x>_cliprect.origin.x && x< _cliprect.size.width) { //下中
    y2 = p.y - _touchPoint.y;
    }
    }else if((x>_cliprect.origin.x && x< _cliprect.origin.x+_cliprect.size.width)&&(y>_cliprect.origin.y && y<_cliprect.origin.y+_cliprect.size.height)){ //正中
    _cliprect.origin.x += (p.x -_touchPoint.x);
    _cliprect.origin.y += (p.y -_touchPoint.y);
    if (_cliprect.origin.x<0) {
    _cliprect.origin.x=0;
    }else if(_cliprect.origin.x>self.bounds.size.width-_cliprect.size.width)
    {
    _cliprect.origin.x=self.bounds.size.width-_cliprect.size.width;
    }
    if (_cliprect.origin.y<0) {
    _cliprect.origin.y=0;
    }else if(_cliprect.origin.y>self.bounds.size.height-_cliprect.size.height)
    {
    _cliprect.origin.y=self.bounds.size.height-_cliprect.size.height;
    }
    }else {
    return;
    }
    //修改rect
    [self ChangeclipEDGE:x1 x2:x2 y1:y1 y2:y2];
    [self setNeedsDisplay];

      _touchPoint = p;

}

    //休整剪切区域

  • (CGRect)ChangeclipEDGE:(float)x1 x2:(float)x2 y1:(float)y1 y2:(float)y2
    {
    _cliprect.origin.x += x1;
    _cliprect.size.width -= x1;
    _cliprect.origin.y += y1;
    _cliprect.size.height -= y1;
    _cliprect.size.width += x2;
    _cliprect.size.height += y2;
    if (_cliprect.size.width<60) {
    if (x1>0.f) {
    _cliprect.origin.x -= 60.0 - _cliprect.size.width;
    }
    _cliprect.size.width = 60;
    }else if(_cliprect.size.height<60) {
    if (y1>0.f) {
    _cliprect.origin.y -= 60.0 - _cliprect.size.height;
    }
    _cliprect.size.height = 60;
    }
    return _cliprect;
    }

  • (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
    {
    _touchPoint = CGPointZero;
    [self setNeedsDisplay];

}

  • (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
    {
    [self touchesEnded:touches withEvent:event];
    }

  • (void)setclipEDGE:(CGRect)rect
    {
    _cliprect = rect;
    [self setNeedsDisplay];
    }

  • (CGRect)getclipRect
    {
    [self ChangeclipEDGE:0 x2:0 y1:0 y2:0];
    [self setNeedsDisplay];
    float imgsize = [_imageView image].size.width;
    float viewsize = [_imageView frame].size.width;
    float scale = imgsize/viewsize;
    CGRect r = CGRectMake(_cliprect.origin.xscale, _cliprect.origin.yscale, _cliprect.size.widthscale, _cliprect.size.heightscale);
    return r;
    }

-(void)setClipRect:(CGRect)rect
{
_cliprect = rect;
[self setNeedsDisplay];
}

-(UIImage*)getClipImageRect:(CGRect)rect
{
CGImageRef imgrefout = CGImageCreateWithImageInRect([_imageView.image CGImage], rect);
UIImage *img_ret = [[UIImage alloc]initWithCGImage:imgrefout];
return img_ret;
}

@end

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