View RemoveTextViewPadding.swift
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// 移除上下的間距 | |
textView.textContainerInset = .zero | |
// 移除左右的間距 | |
textView.textContainer.lineFragmentPadding = 0 |
View 佛祖.swift
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// | |
// _ooOoo_ | |
// o8888888o | |
// 88" . "88 | |
// (| -_- |) | |
// O\ = /O | |
// ____/`---'\____ | |
// . ' \\| |// `. | |
// / \\||| : |||// \ | |
// / _||||| -:- |||||- \ |
View isBeingPresented.swift
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override func viewWillAppear(_ animated: Bool) { | |
super.viewWillAppear(animated) | |
if isBeingPresented { | |
// start timer | |
} | |
} | |
override func viewWillDisappear(_ animated: Bool) { | |
super.viewWillDisappear(animated) |
View isMovingToParent.swift
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override func viewWillAppear(_ animated: Bool) { | |
super.viewWillAppear(animated) | |
if isMovingToParent { | |
// start timer | |
} | |
} | |
override func viewWillDisappear(_ animated: Bool) { | |
super.viewWillDisappear(animated) |
View EnumCount3.swift
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enum SectionTypes: CaseIterable { | |
case header | |
case list | |
} | |
print(SectionTypes.allCases.count) // 2 |
View EnumCount2.swift
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enum SectionType: Int { | |
case header = 0 | |
case list | |
static let count = 2 | |
} | |
print(SectionType.count) // 2 |
View EnumCount1.swift
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enum SectionType: Int { | |
case header = 0 | |
case list | |
static let count: Int = { | |
var max: Int = 0 | |
while let _ = SectionType(rawValue: max) { max += 1 } | |
return max | |
}() | |
} |
View generateQRCode.swift
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static func generateQRCode(from string: String, imageView: UIImageView) -> UIImage? { | |
let data = string.data(using: String.Encoding.ascii) | |
if let filter = CIFilter(name: "CIQRCodeGenerator") { | |
filter.setValue(data, forKey: "inputMessage") | |
// L: 7%, M: 15%, Q: 25%, H: 30% | |
filter.setValue("M", forKey: "inputCorrectionLevel") | |
if let qrImage = filter.outputImage { | |
let scaleX = imageView.frame.size.width / qrImage.extent.size.width |
View LeftAlignedCollectionViewFlowLayout.swift
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class LeftAlignedCollectionViewFlowLayout: UICollectionViewFlowLayout { | |
override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? { | |
let attributes = super.layoutAttributesForElements(in: rect) | |
var leftMargin = sectionInset.left | |
var maxY: CGFloat = -1.0 | |
attributes?.forEach { layoutAttribute in | |
if layoutAttribute.frame.origin.y >= maxY { | |
leftMargin = sectionInset.left |
View PopGestureRecognizer.swift
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self.navigationController?.interactivePopGestureRecognizer?.isEnabled = false |