iOS UIView及其子控件的常用设置

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为控件添加边框

 view.layer.borderWidth = 1; view.layer.borderColor = [[UIColor blackColor] CGColor];

设置button为不能点击且变灰

button.userInteractionEnabled=NO;button.alpha=0.4;

UITextView设置“placeholder”

1.创建

let detailAddTextView = UITextView()                detailAddTextView.frame = CGRectMake(10, 10, self.myTableView!.frame.size.width - 20, 70)                detailAddTextView.delegate = self                detailAddTextView.font = Font(14.0)                cell?.contentView.addSubview(detailAddTextView)                //保存的地址                detailAddTextView.text = self.details                self.details = detailAddTextView.text                //覆盖label                coverLabel = UILabel()                coverLabel!.frame = CGRectMake(detailAddTextView.frame.origin.x + 5, detailAddTextView.frame.origin.y + 8, detailAddTextView.frame.size.width, 20)                coverLabel?.enabled = false                if(detailAddTextView.text.length == 0)                {                    coverLabel?.text = "请填写详细地址,不少于5个字"                }                else                {                    coverLabel?.text = ""                }                                coverLabel?.textColor = UIColor.lightGrayColor()                coverLabel?.font = detailAddTextView.font                cell?.contentView.addSubview(coverLabel!)

2.textView代理方法里

func textViewDidChange(textView: UITextView)    {        if(textView.text?.length == 0)        {            coverLabel?.text = "请填写详细地址,不少于5个字"        }        else        {            coverLabel?.text = ""        }        self.details = textView.text    }

UILabel文字大小随宽度调整

label.adjustsFontSizeToFitWidth=true  //此处的0.6是缩小到0.6倍就不缩小了，如果还是超过那么就省略显示多余部分  label3.minimumScaleFactor=0.6

改变sb或xib中做过约束的控件的frame

把约束像控件一样与代码关联

然后代码设置

self.cmyNameWidth.constant = 100

为UITextField添加字数限制并提示

//添加监听textField.addTarget(self, action: #selector(InfomationView.textFieldDidChange(_:)), forControlEvents: UIControlEvents.EditingChanged)

func textFieldDidChange(textField:UITextField)    {        let lang = textInputMode?.primaryLanguage        if (lang == "zh-Hans") {//简体汉字拼音            let range = textField.markedTextRange            if range == nil {                if (NSString(string:textField.text!).length > 30) {                    textField.text = NSString(string: textField.text!).substring(to: 30)                    self.showAlert(messageStr: "姓名请在30字以内")                }            }        }    }    //弹出提示框    func showAlert(messageStr:String)    {        let myAlert = UIAlertView(title: "提示",message: messageStr,delegate: self,cancelButtonTitle: "好的")        myAlert.show()    }

为 UITextField 设置左边距

//设置textField边距    func setTextFieldLeftPadding(textField:UITextField,forWidth width:CGFloat){        var frame:CGRect = textField.frame        frame.size.width = width        let leftView:UIView = UIView(frame:frame)        textField.leftViewMode = .Always        textField.leftView = leftView    }

修改 TextField placeHolder 字体样式

func newPlaceholder(text:String,font:UIFont,color:UIColor) -> NSAttributedString{    let str = NSAttributedString(string: text, attributes: [NSFontAttributeName:font,NSForegroundColorAttributeName:color])    return str}

textField.attributedPlaceholder = newPlaceholder(defaultPlaceolder, font: Font(14.0), color: UIColor.lightGrayColor())

也可以在xib中进行设置参考：http://blog.csdn.net/wang631106979/article/details/51278531

UIImageView 添加模糊效果

//添加毛玻璃效果        let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.Light)        let blurView = UIVisualEffectView(effect: blurEffect)        blurView.frame = self.BgImgView!.frame        self.BgImgView!.addSubview(blurView)

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