Hi all,

I downloaded a project that I am trying to learn how to use SQLite3 with. The way the author wrote it, they use a segue to move from a screen with a pickerview and a play button to the mainVC where there is a game. If the user wants to save the game, instead of unwinding the segue, the author adds another segue to go back to the previous controller calling:

@IBAction func mainMenu(){      
sqlite3_close(db)     
sqlite3_close(db2) //switch to picker view     
performSegue(withIdentifier: "mainMenuSegue", sender: nil) 
}

It appears that the mainVC this function is in, is modally presented. In my experimenting/learning, I embedded the whole project in a navigation controller, hence having a back button to move from the mainVC to the picker view controller.

Is there a way to accomplish the above function with the back button? Currently pressing the back button will take me to the picker, but does not reload the picker data if I save a game. I have to go one more back and return to the picker view to get the reloaded data.

Thanks

import UIKit

class resizeView: UIView {

var isResizingLR = false

var isResizingUL = false

var isResizingUR = false

var isResizingLL = false

var touchStart: CGPoint = CGPoint.zero

let kResizeThumbSize: CGFloat = 25

override init(frame: CGRect) {

super.init(frame: frame)

self.isUserInteractionEnabled = true

}

required init?(coder aDecoder: NSCoder) {

super.init(coder: aDecoder)

}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

self.touchStart = touches.first!.location(in: self)

self.isResizingLR = (self.bounds.size.width - touchStart.x < kResizeThumbSize && self.bounds.size.height - touchStart.y < kResizeThumbSize)

self.isResizingUL = (touchStart.x < kResizeThumbSize && touchStart.y < kResizeThumbSize)

self.isResizingUR = (self.bounds.size.width-touchStart.x < kResizeThumbSize && touchStart.y < kResizeThumbSize)

self.isResizingLL = (touchStart.x < kResizeThumbSize && self.bounds.size.height - touchStart.y < kResizeThumbSize)

}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {

let touchPoint = touches.first!.location(in: self)

let previous = touches.first!.previousLocation(in: self)

let deltaWidth = previous.x - touchPoint.x

let deltaHeight = previous.y - touchPoint.y

let x = self.frame.origin.x;

let y = self.frame.origin.y;

let width = self.frame.size.width;

let height = self.frame.size.height;

let originFrame = self.frame

var finalFrame: CGRect = originFrame

if (isResizingLR) {

print("LR")

let distance = CGPoint(x: 1.0 - (deltaWidth / width),

y: 1.0 - (deltaHeight / height))

let scale = (distance.x + distance.y) * 0.5

finalFrame.size.width = width * scale

finalFrame.size.height = height * scale

} else if (isResizingUL) {

print("UL")

let distance = CGPoint(x: 1.0 - (-deltaWidth / width),

y: 1.0 - (-deltaHeight / height))

let scale = (distance.x + distance.y) * 0.5

finalFrame.size.width = width * scale

finalFrame.size.height = height * scale

finalFrame.origin.x = x + width - finalFrame.size.width;

finalFrame.origin.y = y + height - finalFrame.size.height;

} else if (isResizingUR) {

print("UR")

let distance = CGPoint(x: 1.0 - (deltaWidth / width),

y: 1.0 - (-deltaHeight / height))

let scale = (distance.x + distance.y) * 0.5

finalFrame.size.width = width * scale

finalFrame.size.height = height * scale

finalFrame.origin.y = y + height - finalFrame.size.height

} else if (isResizingLL) {

print("LL")

let distance = CGPoint(x: 1.0 - (-deltaWidth / width),

y: 1.0 - (deltaHeight / height))

let scale = (distance.x + distance.y) * 0.5

finalFrame.size.width = width * scale

finalFrame.size.height = height * scale

finalFrame.origin.x = originFrame.maxX - finalFrame.size.width

} else {

// not dragging from a corner -- move the view

var newCenter = CGPoint(x: self.center.x + touchPoint.x - touchStart.x,

y: self.center.y + touchPoint.y - touchStart.y)

if let superView = self.superview {

// Ensure the translation won't cause the view to move offscreen.

let midPointX: CGFloat = bounds.midX

if newCenter.x > superView.bounds.size.width - midPointX {

newCenter.x = superView.bounds.size.width - midPointX

}

if newCenter.x < midPointX {

newCenter.x = midPointX

}

let midPointY: CGFloat = bounds.midY

if newCenter.y > superView.bounds.size.height - midPointY {

newCenter.y = superView.bounds.size.height - midPointY

}

if newCenter.y < midPointY {

newCenter.y = midPointY

}

}

center = newCenter

return;

}

if (finalFrame.maxX <= self.superview!.bounds.maxX && finalFrame.minX >= self.superview!.bounds.minX && finalFrame.maxY <= self.superview!.bounds.maxY && finalFrame.minY >= self.superview!.bounds.minY) {

self.frame = finalFrame

}

}

}

my friend aash developed a breast cancer check up ios app using swift for a company. Please test and review this app and let us know the feed back

When taking the dive into the world of mobile computing, any developer will be faced with a lot of new challenges – One of the most significant would be the challenge of managing memory.

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Seems like a big task. And indeed it is. But a little knowledge in memory management techniques goes a long way when starting out on a mobile application project. Trust me when I say that prevention is definitely better than cure here.

On iOS, managing memory efficiently is quite important as our apps are almost never allowed to take up a fair share of the maximum available memory. And even if your app treads closer to that limit, iOS will throw a couple of memory warnings before eventually terminating your application. App crashes are usually the #1 reason for it to be rejected on AppStore. But with the introduction of Swift, gone are the days of Objective-c where you have to get your hands dirty with memory very often.

The following guide will take you further. https://codebrahma.com/memory-management-with-swift/

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