Tag Archives: iOS

Xcode instruments

 The two columns worth noting in Instruments are # Persistent and # Transient. The Persistent column keeps a count of the number of objects of each type that currently exist in memory. The Transient column shows the number of … Continue reading

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Views vs. layers

A layer is a simple model class that exposes a number of properties to represents some image-based content. Every UIView is backed by a layer, so you can think of layers as the lower-level behind the scenes class behind your … Continue reading

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gitsubree usage

Basic commands about subtree git subtree add –prefix=<prefix> <commit> git subtree add –prefix=<prefix> <repository> <ref> git subtree pull –prefix=<prefix> <repository> <ref> git subtree push –prefix=<prefix> <repository> <ref> git subtree merge –prefix=<prefix> <commit> git subtree split –prefix=<prefix> [OPTIONS] [<commit>] 1. Add … Continue reading

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CommentPlus for Swift Func

Usage reference: https://zhihuitang.github.io/2019/01/13/CommentPlus-for-Swift-Func.html Download the Xcode extension from here Unzip and double click the extension CommentPlus.app to install the extension In Xcode, put the cursor on the upper line of func, then select Xcode menu bar: Editor -> CommentGenerator -> … Continue reading

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Intermediate iOS Debugging

1. Stop when exception 1.1 Open Breakpoint navigator (Cmd + 8) 1.2 Add Exception Breakpoint  1.3 Keep default values  1.4 Move breakpoint to User level  2. Edit breakpoint Edit Breakpoint  Add Debugger Command:  We will … Continue reading

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Auto Layout

let view = UIView() view.translatesAutoresizingMaskIntoConstraints = false Interface Builder will automatically set its value to false if the view has constraints defined. But for the views created in code, it defaults to true. UIView has a property called auto resizing … Continue reading

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Key-Value Observing

Key-value observing is a mechanism that allows objects to be notified of changes to specified properties of other objects. You can use key-value observing with a Swift class, as long as the class inherits from the NSObject class. You can … Continue reading

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