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我试图添加see more功能，像this。我UITextView这是一个tableView'scell内和我使用这个类，这是基本的TableView的一个按钮，扩大了的TextView其需要高度的子类：更新tableView当单元格的元素的框架更改
@IBDesignable
class ReadMoreTextView: UITextView {
override init(frame: CGRect, textContainer: NSTextContainer?) {
super.init(frame: frame, textContainer: textContainer)
scrollEnabled = false
editable = false
}
convenience init(frame: CGRect) {
self.init(frame: frame, textContainer: nil)
}
convenience init() {
self.init(frame: CGRectZero, textContainer: nil)
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
scrollEnabled = false
editable = false
}
convenience init(maximumNumberOfLines: Int, trimText: NSString?, shouldTrim: Bool) {
self.init()
self.maximumNumberOfLines = maximumNumberOfLines
self.trimText = trimText
self.shouldTrim = shouldTrim
}
convenience init(maximumNumberOfLines: Int, attributedTrimText: NSAttributedString?, shouldTrim: Bool) {
self.init()
self.maximumNumberOfLines = maximumNumberOfLines
self.attributedTrimText = attributedTrimText
self.shouldTrim = shouldTrim
}
@IBInspectable
var maximumNumberOfLines: Int = 0 {
didSet { setNeedsLayout() }
}
@IBInspectable
var trimText: NSString? {
didSet { setNeedsLayout() }
}
var attributedTrimText: NSAttributedString? {
didSet { setNeedsLayout() }
}
@IBInspectable
var shouldTrim: Bool = false {
didSet { setNeedsLayout() }
}
var trimTextRangePadding: UIEdgeInsets = UIEdgeInsetsZero
var appendTrimTextPrefix: Bool = true
var trimTextPrefix: String = "..."
private var originalText: String!
override var text: String! {
didSet {
originalText = text
originalAttributedText = nil
if needsTrim() { updateText() }
}
}
private var originalAttributedText: NSAttributedString!
override var attributedText: NSAttributedString! {
didSet {
originalAttributedText = attributedText
originalText = nil
if needsTrim() { updateText() }
}
}
override func layoutSubviews() {
super.layoutSubviews()
needsTrim() ? updateText() : resetText()
}
func needsTrim() -> Bool {
return shouldTrim && _trimText != nil
}
func updateText() {
textContainer.maximumNumberOfLines = maximumNumberOfLines
textContainer.size = CGSizeMake(bounds.size.width, CGFloat.max)
let range = rangeToReplaceWithTrimText()
if range.location != NSNotFound {
let prefix = appendTrimTextPrefix ? trimTextPrefix : ""
if let text = trimText?.mutableCopy() as? NSMutableString {
text.insertString("\(prefix) ", atIndex: 0)
textStorage.replaceCharactersInRange(range, withString: text as String)
}
else if let text = attributedTrimText?.mutableCopy() as? NSMutableAttributedString {
text.insertAttributedString(NSAttributedString(string: "\(prefix) "), atIndex: 0)
textStorage.replaceCharactersInRange(range, withAttributedString: text)
}
}
invalidateIntrinsicContentSize()
}
func resetText() {
textContainer.maximumNumberOfLines = 0
if originalText != nil {
textStorage.replaceCharactersInRange(NSMakeRange(0, countElements(text!)), withString: originalText)
print("Trim Pressed resetText")
}
else if originalAttributedText != nil {
textStorage.replaceCharactersInRange(NSMakeRange(0, countElements(text!)), withAttributedString: originalAttributedText)
}
invalidateIntrinsicContentSize()
// maybe this is what we're looking for
}
override func intrinsicContentSize() -> CGSize {
textContainer.size = CGSizeMake(bounds.size.width, CGFloat.max)
var intrinsicContentSize = layoutManager.boundingRectForGlyphRange(layoutManager.glyphRangeForTextContainer(textContainer), inTextContainer: textContainer).size
intrinsicContentSize.width = UIViewNoIntrinsicMetric
intrinsicContentSize.height += (textContainerInset.top + textContainerInset.bottom)
return intrinsicContentSize
}
override func hitTest(point: CGPoint, withEvent event: UIEvent?) -> UIView? {
if needsTrim() && pointInTrimTextRange(point) {
shouldTrim = false
maximumNumberOfLines = 0
}
return super.hitTest(point, withEvent: event)
}
//MARK: Private methods
private var _trimText: NSString? {
get {
return trimText ?? attributedTrimText?.string
}
}
private var _trimTextPrefixLength: Int {
get {
return appendTrimTextPrefix ? countElements(trimTextPrefix) + 1 : 1
}
}
private var _originalTextLength: Int {
get {
if originalText != nil {
return countElements(originalText!)
}
else if originalAttributedText != nil {
return originalAttributedText!.length
}
return 0
}
}
private func rangeToReplaceWithTrimText() -> NSRange {
let emptyRange = NSMakeRange(NSNotFound, 0)
var rangeToReplace = layoutManager.characterRangeThatFits(textContainer)
if NSMaxRange(rangeToReplace) == _originalTextLength {
rangeToReplace = emptyRange
}
else {
rangeToReplace.location = NSMaxRange(rangeToReplace) - _trimText!.length - _trimTextPrefixLength
if rangeToReplace.location < 0 {
rangeToReplace = emptyRange
}
else {
rangeToReplace.length = textStorage.length - rangeToReplace.location
}
}
return rangeToReplace
}
private func trimTextRange() -> NSRange {
var trimTextRange = rangeToReplaceWithTrimText()
if trimTextRange.location != NSNotFound {
trimTextRange.length = _trimTextPrefixLength + _trimText!.length
}
return trimTextRange
}
private func pointInTrimTextRange(point: CGPoint) -> Bool {
let offset = CGPointMake(textContainerInset.left, textContainerInset.top)
var boundingRect = layoutManager.boundingRectForCharacterRange(trimTextRange(), inTextContainer: textContainer, textContainerOffset: offset)
boundingRect = CGRectOffset(boundingRect, textContainerInset.left, textContainerInset.top)
boundingRect = CGRectInset(boundingRect, -(trimTextRangePadding.left + trimTextRangePadding.right), -(trimTextRangePadding.top + trimTextRangePadding.bottom))
return CGRectContainsPoint(boundingRect, point)
}
func countElements(text: String) -> Int {
return text.characters.count
}
}
//MARK: NSLayoutManager extension
extension NSLayoutManager {
func characterRangeThatFits(textContainer: NSTextContainer) -> NSRange {
var rangeThatFits = self.glyphRangeForTextContainer(textContainer)
rangeThatFits = self.characterRangeForGlyphRange(rangeThatFits, actualGlyphRange: nil)
return rangeThatFits
}
func boundingRectForCharacterRange(range: NSRange, inTextContainer textContainer: NSTextContainer, textContainerOffset: CGPoint) -> CGRect {
let glyphRange = self.glyphRangeForCharacterRange(range, actualCharacterRange: nil)
let boundingRect = self.boundingRectForGlyphRange(glyphRange, inTextContainer: textContainer)
return boundingRect
}
}
上述工作正常，如果我的textView是在一个ViewController，但因为我有这里面的单元格在UITableViewController，我不能够更新单元格的高度与新的TextView的高度（更新的textView）任何想法如何更新我的tableView时，textView的高度更新？
P.S.我知道我必须使用tableView.beginUpdate,endUpdate，但我问什么时候使用？如何知道textView的帧是否已更改
您是否尝试过设置你的tableview的属性'RequiredHeight'（我不知道它的确切名称，但在智能感知什么仰望与'高度'在它）到'UITableView.AutomaticDimension'？ –
我会建议以下库： - https://github.com/Ramotion/folding-cell – MShah
男人我只想扩大单元格，当用户在单元格中点击@ZIL这就是为什么设置AutomaticDimension不会为我工作 –