import UIKit
let chatCellHeight: CGFloat = 72
let chatCellInsetLeft = chatCellHeight + 8
class ChatCell:UITableViewCell {
let userPictureImageView:UIImageView
let userNameLabel:UILabel
let lastMessageTextLabel:UILabel
let lastMessageSentDateLable:UILabel
let userNameInitialsLabel:UILabel
override init(style:UITableViewCellStyle, reuseIdentifier:String?) {
let pictureSize:CGFloat = 64
userPictureImageView = UIImageView(frame:CGRect(x:8,y:(chatCellHeight-pictureSize)/2,pictureSize,height:pictureSize))
userPictureImageView.backgroundColor = UIColor(red:199/255.0,green:199/255.0,blue:204/255.0,alpha:1)
userPictureImageView.layer.cornerRadius = pictureSize/2
userPictureImageView.layer.masksToBounds = true//将位于它之下的层
userNameLabel = UILabel(frame:CGRectZero)
userNameLabel.backgroundColor = UIColor.whiteColor
userNameLabel.font = UIFont.systemFontOfSize(17)
lastMessageTextLabel = UILabel(frame:CGRectZero)
lastMessageTextLabel.backgroundColor = UIColor.whiteColor()
lastMessageTextLabel.font = UIFont.systemFontOfSize(15)
lastMessageTextLabel.numberOfLines= 2
lastMessageTextLabel.textColor = UIColor(red:142/255,green:142/255,blue:147/255,alpha:1)
lastMessageSentDateLabel = UILabel(frame:CGRectZero)
lastMessageSentDateLabel.autoresizingMask = .FlexibleLeftMargin
lastMessageSentDateLabel.backgroundColor = UIColor.whiteColor()
lastMessageSentDateLabel.font = UIFont.systemFontOfSize(15)
lastMessageSentDateLabel.textColor = lastMessageTextLabel.textColor
userNameInitialsLabel = UILabel(frame:CGRectZero)
userNameInitialsLabel.font = UIFont.systemFontOfSize(33)
userNameInitialsLabel.textAlignment = .Center
userNameInitialsLabel.textColor = UIColor.whiteColor()
super.init(style:style, reuseIdentifier:reuseIdentifier)
contentView.addSubView(userPictureImageView)
contentView.addSubView(userNameLabel)
contentView.addSubView(lastMessageTextLabel)
contentView.addSubView(lastMessageSentDataLabel)
userPictureImageView.addSubview(userNameInitialsLabel)
userNameLabel.setTranslateAutoresizingMaskIntoConstraints(false)
contentView.addConstraint(NSLayoutConstraint(item:userNameLabel,attribute:.Left,.Equal, toItem:contentView,attribute:.Left,multipler:1,constant:chatCellInsetLeft))
contentView.addConstraint(NSlayoutContrstraint(item: userNameLabel,attribute:.Top,
relatedBy:.Equal,toItem:contentView,attribute:.Top,multiplier:1,constant:6))
lastMessageTextLabel.setTranslatesAutoresizingMaskIntoConstraints(true)
super.init(style:style, reuseIdentifier:reuseIdentifier)
contentView.
lastMessageTextLabel.setTranslatesAutoresizingMaskIntoConstraints(false)
contentView.addConstraint(NSLayoutConstraint(item:lastMessageTextLabel,attribute:.Left,relatedBy:.Equal,toItem:userNameLabel,attribute:.Left,mltipllier:1,constrant:0))
contentView.addConstraint(NSLayoutConstraint(item:lastMessageTextLabel,attribute:.Top,relatedBy:.Equal,toItem:contentView.,attribute:.Top,multiplier:1,constant:28))
contentView.addConstraint(NSLayoutConstraint(item:lastMessageTextLabel,attribute:.right,relatedBy:.Equal,toItem:contentView,attribute:.Right,multiplier:1,constant:-7))
contentView.addConstraint(NSLayoutConstraint(item:lastMessageTextLabel,attribute:.Bottom,relatedBy:.LessThanOrEquqal,toItem:contentView,attribute:.Bottom,multiplier:1,constant:-4))
lastMessageSentDateLabel.setTranslateAutoresizingMaskIntoConstrains(false)
contentView.addConstraint(NSLayoutConstraint(item:lastMessageSentDateLabel,attribute:.Left,elatedBy:.Equal,toItem:userNameLable,attribute:.Right,multiplierL1,constant:2))
contentView.addConstraint(NSLayoutConstraint(item:lastMessageSentDateLabel,attribute:.Right,relatedBy:.Equal,toItem:contentView,attribute:.Right,multipliter:1,constant:-7))
contentView.addConstraint(NSlabyoutConstraint(item:lastMessageSentDateLabel,attribute:.Baseline,relaedBy:.Equal,toItem:userNameLable,attrubute:.Baseline,multiplier:1,constant:0))
userNameInitialsLabel.setTranslatesAutoresizingMaskIntoConstraints(false)
userPictureImageView.addConstraint(NSLayoutConstraint(item:userNameInitialsLabel,attribute:.CenterX,relatedBy:.Equal,toItem:userPictureImageView,attribute:.CenterX,multiplier:1,constant:0))
userPictureImageView.addConstraint(NSLayoutConstraint(item:userNameInitialsLabel,attribue:.CenterY,relatedBy:.Equal,toItem:userPictureImageView,attribute:.CenterY,multiplier:1,constant:-1))
}
required init(coder aDecoder:NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func configureWithChat(chat:Chat) {
let user = chat.user
userPictureImageView.image = UIImage(named:user.pictureName())
if userPictureImageView.image == nil {
let initials = user.initials
if initials != nil {
userNameInitialsLabel.text = initials
userNameInitialsLabel.hidden = false
} else {
userPictureImageView.image = UIImage(named:"User0")
userNameInitialsLabel.hidden = true
}
} else {
userNameInitialsLabel.hidden = true
}
userNameLabel.text = user.name
lastMessageTextLabel.text = chat.lastMessageText
lastMessageSentDateLabel.text = chat.lastMessageSentDateString
}
}