CODEWITHSUNDEEP
iosiphoneimageuiimageswift4.2
bAthi
bAthi

Reputation: 381

How to check a UIView placed inside of UIImage portion or not in iOS?

According to my requirement i need to check UIView are placed inside of UIImage portion or not.Suppose i have UIImage of human with cap, here i need to check my view placed inside of cap portion or not.

Could you please guide me to achieve following requirement.

Example:

      ---------------------------------
     |                                |
     |          UIImage               |
     |   --------------------------   |
     |  |   Image portion          |  |
     |  |              ------      |  |
     |  |             | view |     |  |
     |  |              ------      |  |
     |  |                          |  |
     |   --------------------------   |
     |                                |
     |                                |
     --------------------------------

Upvotes: 10

Views: 399

Answers (4)

Prashant Tukadiya
Prashant Tukadiya

Reputation: 16436

You have already got idea that how to check that two CGRect is overlapping or not. with @Mario's answer.

Question is how you can get image size from imageView which is 

AVMakeRect(aspectRatio: myImage.size, insideRect: sampleImageView.frame)

But one more thing you need to take care about contains(_:) or intersects(_:) of CGRect is that both should have same superview. like

Main( UIView) -> UIImageView

and

Main( UIView) -> UIView(that need to be checked)

If this condition is not applying with your view hierarchy you have options to convert rect using

1) convertRect:fromView: Docs

2) convertRect:toView Docs

Hope it is helpful

Upvotes: 0

Harshal Yanpallewar
Harshal Yanpallewar

Reputation: 2122

In fact, it's built-in since iOS 4 (for UIViewContentModeScaleAspectFit):

@import AVFoundation;

AVMakeRectWithAspectRatioInsideRect(imageView.image.size, imageView.bounds);

Since frame components may be not round numbers, consider wrapping the call by

CGRectIntegral(…)

see https://nshipster.com/image-resizing/ for more info.

Upvotes: 0

Jatin Kathrotiya
Jatin Kathrotiya

Reputation: 539

  • import AVFoundation

  • Get Rect For image View and Convert rect as per image size using AVMakeRect.

  • Check new rect contain UIView frame using contains method of coordinate system

Code : 

import UIKit
import AVFoundation

func containViewInSideImage(imgView:UIImageView,innerView:UIView) -> Bool  {
        let size = imgView.image?.size  // size of image
        let imageRect = AVMakeRect(aspectRatio: size!, insideRect: imgView.frame)  // rect of image portion
        return imageRect.contains(innerView.frame)  // check view is inside image rect
 }

Note : Above code will work for aspect-fit property of image view and Make Sure imageView and view both are belong to same supper view otherwise need to convert rect

Upvotes: 0

Mario
Mario

Reputation: 459

You could use the method contains(_:) or intersects(_:) of CGRect. Your code will look something like

let imagePortionFrame = CGRect(....) // some rect based on your image view imagePortionFrame.contains(view.frame)

You just need to make sure that the coordinates of imagePortionFrame and view.frame are expressed using the same coordinate system; if not you could use the method convert(_:to:)

Reference:

Upvotes: 3

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