IOS Drawing (drawrect) Picture cropped red box

A red box is displayed in real time as your finger slides on the screen, which you can use to crop the picture. Create a new UIView class that inherits from the UIView and makes a drawing operation inside. The proxy method can be implemented in the required Uiviewcontroller. Picture clipping method, will be introduced in detail later, here do not explain. and code as follows:

MyView.h

Avatar Editor

Created by 15/5/8.

Copyright (c) years Dong. All rights reserved.

#import <UIKit/UIKit.h>

// Agent biography Pictures

@protocol geteditedimagedelegate <nsobject>

-(void) Getnewimage: (cgrect) newrect;

@end

@interface MyView:UIView

@property (nonatomic,strong) uiimageview *imageview;

Image

@property (nonatomic,strong) UIImage *myimage;

@property (nonatomic,assign)ID<geteditedimagedelegate> Getimagedelegate;

@end

myview.m

Avatar Editor

Created by 15/5/8.

Copyright (c) years Dong. All rights reserved.

#import "MyView.h"

@implementation MyView

{

Cgpoint Firsttouch;

Cgpoint Lasttouch;

Cgpoint LastTouch1;

}

-(instancetype) initWithFrame: (CGRect) frame

{

self = [superinitwithframe: frame];

if (self) {

}

return self;

}

// start touch

-(void) Touchesbegan: (nsset *) touches withevent: (uievent *) event

{

uitouch *touch = [touches anyobject];

// get touch points

Firsttouch = [Touchlocationinview:self];

}

-(void) touchesmoved: (nsset *) touches withevent: (uievent *) event

{

uitouch *touch = [touches anyobject];

Lasttouch = [Touchlocationinview:self];

/**

* The shape between the starting point and the user finger drag point is plotted in real time

*/

[self setneedsdisplay];

}

-(void) touchesended: (nsset *) touches withevent: (uievent *) event

{

uitouch *touch = [touches anyobject];

Lasttouch = [Touchlocationinview:self];

[self setneedsdisplay];

cgrect rec = cgrectmake(firsttouch. X,firsttouch. Y,lasttouch. X -firsttouch. X,lasttouch. Y -firsttouch. Y);

/**

*

* Get an agent method for cropping picture size

* */

[self. Getimagedelegategetnewimage: rec];

}

// Get Rectangle

-(cgrect) currect

{

returncgrectmake(firsttouch. X,firsttouch. Y,lasttouch. X -firsttouch. X,lasttouch. Y -firsttouch. Y);

}

-(void) DrawRect: (cgrect) Rect {

//Drawing code

// Get the device context view as Canvas

Cgcontextref context = Uigraphicsgetcurrentcontext ();

//need to display the Red Box

Cgcontextsetstrokecolorwithcolor (context, [Uicolor Redcolor]. Cgcolor);

Cgcontextstrokerect (context, [ self currect]);

}

@end

IOS Drawing (drawrect) Picture cropped red box