SwiftUtils

Small pieces of code which I'm using in many of my projects.

1. Style

Simple class for creating and combining styles for UI controls.

Example:

let labelTextStyle = Style<UILabel> { label in
    label.textColor = UIColor.lightGray
    label.font = UIFont.systemFont(ofSize: 20.0)
}

let labelBorderStyle = Style<UILabel> { label in
    label.layer.borderColor = UIColor.darkGray.cgColor
    label.layer.borderWidth = 4.0
}

let defaultLabelStyle = labelTextStyle + labelBorderStyle

let label = UILabel()
label.text = "Sample text"
label.apply(style: defaultLabelStyle)

2. Result

Result type for Swift.

Example:

enum SomeError: Error {}

let result: Result<Int, SomeError> = .success(42)

result.ifSuccess { value in
    print("Success")
}.else { error in
    print("Failure")
}

3. ReusableIdentifier

A set of extensions, which add identifier property for all UITableViewCells and UICollectionReusableViews. They also create helper methods for UITableView and UICollectionView which automatically uses generated identifiers to registering and dequeuing cells.

Example:

class SomeCell: UICollectionViewCell {
    // ...
}

let collectionView = UICollectionView(
    frame: CGRect.zero,
    collectionViewLayout: UICollectionViewFlowLayout()
)
collectionView.register(VineyardsCollectionViewCell.self)
let cell = collectionView.dequeueReusableCell(
    ofType: SomeCell.self,
    forIndexPath: indexPath
) // Note that cell already has SomeCell type, so you don't need to cast it

4. UIStackView+Margins

Simple extension which allows to add margins to arrangd subview.

Example:

let stackView = UIStackView()
let view = UIView(frame: CGRect(x: 0.0, y: 0.0, width: 200.0, height: 80.0))
stackView.addArrangedSubview(
    view,
    withMargins: UIEdgeInsets(top: 0.0, left: 20.0, bottom: 0.0, right: 0.0)
)