1.条件判断区间
#pragma mark ==============条件判断区间==============
let age = 19
if 18...25 ~= age {
print("条件满足")
}
同
if age >= 18 && age <= 25 {
print("条件满足")
}
同
if case 18...25 = age {
print("条件满足")
}
2.多标志符字符串分割成数组
#pragma mark ==============多标志符字符串分割==============
let text = "abc,vfr.yyuu"
let set = CharacterSet(charactersIn: ",.")
print(text.components(separatedBy: set))
// ["abc", "vfr", "yyuu"]
3.字符串是否为空
#pragma mark ==============字符串是否为空==============
Non-Optional String
Check for zero length.
let myString: String = ""
if myString.isEmpty {
print("String is empty.")
return // or break, continue, throw
}
// myString is not empty (if this point is reached)
print(myString)
Optional String
Check for nil or zero length.
let myOptionalString: String? = nil
guard let myString = myOptionalString, !myString.isEmpty else {
print("String is nil or empty.")
return // or break, continue, throw
}
/// myString is neither nil nor empty (if this point is reached)
print(myString)
4.字符串是否包含空格
#pragma mark ==============字符串是否包含空格==============
Here is how I check if string is blank. By 'blank' I mean a string that is either empty or contains only space/newline characters.
struct MyString {
static func blank(text: String) -> Bool {
let trimmed = text.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
return trimmed.isEmpty
}
}
How to use:
MyString.blank(" ") // true
5.数组元素求和
#pragma mark ==============可变参数累加,数组元素求和==============
func sum(input: Int...) -> Int {
return input.reduce(0, +)
}
print(sum(input: 1,2,3,4,5)) // 15
let arr: [Int] = [1, 2, 3]
print(arr.reduce(0, +))
// 字符串数组累加
let ss: [String] = ["hon", "zon", "-0"]
print(ss.reduce("", +))
// 输出：honzon-0
6.字符串是否包含数组中的元素
#pragma mark ==============字符串是否包含数组中的元素==============
let words = ["Swift","iOS","cocoa","OSX","tvOS"]
let tweet = "This is an example tweet larking about Swift"
let valid = !words.filter ({ tweet.contains($0)}).isEmpty
或者
let valid2 = words.contains(where: tweet.contains)
print(valid)
7.导航栏返回图标
#pragma mark ==============导航栏返回图标==============
self.navigationController?.navigationBar.backIndicatorTransitionMaskImage = UIImage(named:"find")
self.navigationController?.navigationBar.backIndicatorImage = UIImage(named:"find")
8.画虚线
#pragma mark ==============画虚线==============
func drawDottedLine(lineView: UIView, offset: CGPoint) {
let shapeLayer = CAShapeLayer()
shapeLayer.bounds = lineView.bounds
shapeLayer.position = lineView.layer.position
shapeLayer.fillColor = nil
shapeLayer.strokeColor = UIColor.blue.cgColor
shapeLayer.lineWidth = 0.5
shapeLayer.lineJoin = kCALineJoinRound
// 4=线的宽度 1=每条线的间距
shapeLayer.lineDashPattern = [NSNumber(value: 4), NSNumber(value: 1)]
let path = CGMutablePath()
path.move(to: CGPoint(x: offset.x, y: offset.y))
path.addLine(to: CGPoint(x: lineView.frame.width - offset.x, y: offset.y))
shapeLayer.path = path
lineView.layer.addSublayer(shapeLayer)
}
9.部分圆角图片
#pragma mark ==============部分圆角图片==============
func cornerImage(frame: CGRect, image: UIImage, Radii: CGSize) -> UIImageView {
let imageView = UIImageView(image: image)
imageView.frame = frame
let bezierPath = UIBezierPath(roundedRect: imageView.bounds, byRoundingCorners: [.topLeft, .topRight], cornerRadii: Radii)
let shapeLayer = CAShapeLayer()
shapeLayer.path = bezierPath.cgPath
imageView.layer.mask = shapeLayer
return imageView
}
10.修改状态栏背景颜色
#pragma mark ==============修改状态栏背景颜色==============
func setStatusBarBackgroundColor(color: UIColor) {
let statusBarWindow = UIApplication.shared.value(forKey: "statusBarWindow") as? UIView
guard let statusBar = statusBarWindow?.value(forKey: "statusBar") as? UIView else {
return
}
statusBar.backgroundColor = color
}
11.UIImage加载
#pragma mark ==============UIImage加载==============
UIImage(named: "imageName")// caching
UIImage(contentsOfFile: "imageName")// no caching
如果你要加载一个大图片而且是一次性使用，那么就没必要缓存这个图片，用contentsOfFile足矣，这样不会浪费内存来缓存它。
然而，在图片反复重用的情况下named是一个好得多的选择。
12.UIButton响应区域大小
#pragma mark ==============UIButton响应区域44*44==============
extension UIButton {
//处理button太小
open override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
// if the button is hidden/disabled/transparent it can't be hit
if self.isHidden || !self.isUserInteractionEnabled || self.alpha < 0.01 { return nil }
// increase the hit frame to be at least as big as `minimumHitArea`
let buttonSize = bounds.size
let widthToAdd = max(44 - buttonSize.width, 0)
let heightToAdd = max(44 - buttonSize.height, 0)
let largerFrame = bounds.insetBy(dx: -widthToAdd / 2, dy: -heightToAdd / 2)
// perform hit test on larger frame
return largerFrame.contains(point) ? self : nil
}
}
13.忽略警告
pragma mark ==============忽略警告==============
public extension Bool {
// 默认情况下编译器就是会去检查返回参数是否有被使用，没有的话就会给出警告。如果你不想要这个警告，可以自己手动加上 @discardableResult
@discardableResult public mutating func m_toggle() -> Bool {
self = !self
return self
}
}
14.IBDesignable/IBInspectable 可视化xib/storyboard 属性设置
示例
// IBDesignable/IBInspectable，是iOS8的新特性。其主要功能是可以直接在XIB或者Storyboard中直接，设置UI类的属性。例如我们自定义一些控件，可以把控件的属性映射到XIB上
简单的说,就是自定义View的属性,可视化,在xib/Storyboard中可设置,主要用于复杂控件属性的设置
@IBDesignable
class RatingBar: UIView {
@IBInspectable var ratingMax: CGFloat = 10 //总分
@IBInspectable var starNums: Int = 5 //星星总数
//分数
@IBInspectable var rating: CGFloat = 0 {
didSet {
if 0 > rating { rating = 0 }
else if ratingMax < rating { rating = ratingMax }
//回调给代理
self.setNeedsLayout()
}
}
@IBInspectable var imageLight: UIImage = UIImage(named: "ratingbar_star_light")!
@IBInspectable var imageDark: UIImage = UIImage(named: "ratingbar_star_dark")!
@IBInspectable var canAnimation: Bool = false //是否开启动画模式
@IBInspectable var animationTimeInterval: TimeInterval = 0.2 //动画时间
@IBInspectable var isIndicator: Bool = false //是否是一个指示器 (用户无法进行更改)
private var foregroundRatingView: UIView!
private var backgroundRatingView: UIView!
private var isDrew = false //是否创建过
override init(frame: CGRect) {
super.init(frame: frame)
// self.buildView()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
demo.png
/// 遍历删除subView
self.subviews.forEach({$0.removeFromSuperview()})
/// 打开设置界面
let urlObj = URL(string:UIApplicationOpenSettingsURLString)
if #available(iOS 10.0, *) {
UIApplication.shared.open(urlObj! as URL, options: [ : ], completionHandler: { Success in
})} else {
UIApplication.shared.openURL(urlObj!)
}
}
15.颜色输入（即视功能）
color2.png
color.png
16.图片输入（即视功能）
- 1.同颜色输入一样,代码直接输入image literal,左键双击缩略图标
image.png
- 2.直接写图片名称
image2.png
原文链接