83 lines
2.9 KiB
Swift
83 lines
2.9 KiB
Swift
//
|
|
// Copyright (c) 2017 Touch Instinct
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
// THE SOFTWARE.
|
|
//
|
|
|
|
import UIKit
|
|
|
|
/**
|
|
* Struct for holding result of string size calculation
|
|
*/
|
|
public struct StringSizeCalculationResult {
|
|
|
|
public let size: CGSize
|
|
public let fontLineHeight: CGFloat?
|
|
|
|
}
|
|
|
|
public extension StringSizeCalculationResult {
|
|
|
|
var height: CGFloat { return size.height }
|
|
|
|
var width: CGFloat { return size.width }
|
|
|
|
var numberOfLines: UInt? {
|
|
if let lineHeight = fontLineHeight {
|
|
let lineHeightRounded = Double(lineHeight).roundValue(withPersicion: 2)
|
|
|
|
let heightRounded = Double(height).roundValue(withPersicion: 2)
|
|
|
|
let numberOfLines = ceil(heightRounded / lineHeightRounded)
|
|
|
|
return UInt(numberOfLines)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
}
|
|
|
|
public extension String {
|
|
|
|
/**
|
|
method which calculates string size based on given character attributes and (optional) max width and height
|
|
|
|
- parameter attributes: dictionary with string character attributes
|
|
- parameter maxWidth: maximum width of text
|
|
- parameter maxHeight: maximum height of text
|
|
|
|
- returns: string size calculation result
|
|
*/
|
|
func size(withAttributes attributes: [NSAttributedStringKey: AnyObject]?,
|
|
maxWidth: CGFloat = CGFloat.greatestFiniteMagnitude,
|
|
maxHeight: CGFloat = CGFloat.greatestFiniteMagnitude) -> StringSizeCalculationResult {
|
|
|
|
let size = self.boundingRect(with: CGSize(width: maxWidth, height: maxHeight),
|
|
options: [.usesLineFragmentOrigin, .usesFontLeading],
|
|
attributes: attributes,
|
|
context: nil).size
|
|
|
|
let fontLineHeight = (attributes?[NSAttributedStringKey.font] as? UIFont)?.lineHeight
|
|
|
|
return StringSizeCalculationResult(size: size, fontLineHeight: fontLineHeight)
|
|
}
|
|
|
|
}
|