Type 'Int' Does Not Conform to Protocol 'Booleantype'

Type 'Int' does not conform to protocol 'BooleanType'?

In Swift you can't implicitly substitute Int instead of Bool. This was done to prevent confusion and make code more readable.

So instead of this

let x = 10
if x { /* do something */ }

You have to write this:

let x = 10
if x != 0 { /* do something */ }

Also you can't pass an Optional instead of Bool to check if it's nil, as you would do in Objective-C. Use explicit comparison instead:

if myObject != nil { /* do something */ }

Type 'Int' does not conform to protocol 'BooleanType'

If you want to check, if your currentRow and indexPath are both 5 you can't use an if-statement like that. Change it to:

 if indexPath.row == currentRow?.row  && currentRow == 5 {

or:

 if indexPath.row == 5  && currentRow?.row == 5 {

If you want to check if indexPath is nil check if the indexPath is 0

if indexPath.row != 0 && currentRow?.row == 5 {

Type () does not conform to protocol

Try this:

        arrayBuildingImage[i] = UIImage(contentsOfFile: path)?
        if ( arrayBuildingImage[i] != nil ) {//ERROR HERE

        }
        else{
            break
        }

Playground execution failed: EXPR:15:33: error: type 'Int' does not conform to protocol 'BooleanType'

You're missing some of your logic. Change

else if (number % 3 == 0) && (number % 5)

to

else if (number % 3 == 0) && (number % 5 == 0)

Swift 2.0 Type '()' does not conform to protocol

It looks that lockForConfiguration returns Void and throws, so return value does not conform to BooleanType.

I think that the following code should work for you:

if let device = captureDevice {
    do {
        try device.lockForConfiguration()
        device.focusPointOfInterest = focusPoint
        device.focusMode = AVCaptureFocusMode.ContinuousAutoFocus
        device.exposurePointOfInterest = focusPoint
        device.exposureMode = AVCaptureExposureMode.ContinuousAutoExposure
        device.unlockForConfiguration()
    }
    catch {
        print("Error")
    }
} 

Inline if statement mutating inout parameter in a void return closure, weird error (Error: type 'Int1' does not conform to protocol 'BooleanType')

(Adding this thin answer to close the no-longer-relevant question)

The bug described in the question above is no longer present in Swift 2.2 (Xcode 7.3) nor in the Swift 3.0-dev at IBM Sandbox; so the issue seems to have been fixed in with the release of Swift 2.2.

Type HalfOpenIntervalT does not conform to protocol BooleanType

Ranges are meant to be used in a for in loop:

for i in 0..<cellCount! {
    // do stuff
}

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