UITextViewでのPlaceHolder(プレースホルダ)をSwiftで実装する方法 ref: http://qiita.com/matsuhisa@github/items/5f4877e8ec89729de824
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import UIKit | |
public class UIPlaceHolderTextView: UITextView { | |
lazy var placeHolderLabel:UILabel = UILabel() | |
var placeHolderColor:UIColor = UIColor.lightGrayColor() | |
var placeHolder:NSString = "" | |
required public init(coder aDecoder: NSCoder) { | |
super.init(coder: aDecoder) | |
} | |
override init(frame: CGRect){ | |
super.init(frame: frame) | |
} | |
override init() { | |
super.init() | |
} | |
deinit { | |
NSNotificationCenter.defaultCenter().removeObserver(self) | |
} | |
override public func awakeFromNib() { | |
super.awakeFromNib() | |
NSNotificationCenter.defaultCenter().addObserver(self, selector: "textChanged:", name: UITextViewTextDidChangeNotification, object: nil) | |
} | |
func setText(text:NSString) { | |
super.text = text | |
self.textChanged(nil) | |
} | |
override public func drawRect(rect: CGRect) { | |
if(self.placeHolder.length > 0) { | |
self.placeHolderLabel.frame = CGRectMake(8,8,self.bounds.size.width - 16,0) | |
self.placeHolderLabel.lineBreakMode = NSLineBreakMode.ByWordWrapping | |
self.placeHolderLabel.numberOfLines = 0 | |
self.placeHolderLabel.font = self.font | |
self.placeHolderLabel.backgroundColor = UIColor.clearColor() | |
self.placeHolderLabel.textColor = self.placeHolderColor | |
self.placeHolderLabel.alpha = 0 | |
self.placeHolderLabel.tag = 999 | |
self.placeHolderLabel.text = self.placeHolder | |
self.placeHolderLabel.sizeToFit() | |
self.addSubview(placeHolderLabel) | |
} | |
self.sendSubviewToBack(placeHolderLabel) | |
if(self.text.utf16Count == 0 && self.placeHolder.length > 0){ | |
self.viewWithTag(999)?.alpha = 1 | |
} | |
super.drawRect(rect) | |
} | |
public func textChanged(notification:NSNotification?) -> (Void) { | |
if(self.placeHolder.length == 0){ | |
return | |
} | |
if(countElements(self.text) == 0) { | |
self.viewWithTag(999)?.alpha = 1 | |
}else{ | |
self.viewWithTag(999)?.alpha = 0 | |
} | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import UIKit | |
class ViewController: UIViewController { | |
@IBOutlet weak var TestWebView: UIWebView! | |
@IBOutlet weak var InputView: UIPlaceHolderTextView! | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
InputView.placeHolder = "本文です。" | |
InputView.placeHolderColor = UIColor(red: 255, green: 0, blue: 0, alpha: 0.5) | |
} | |
override func didReceiveMemoryWarning() { | |
super.didReceiveMemoryWarning() | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment