MPITextKit

             

Powerful text framework for iOS to display rich text based on TextKit, inspired by Texture and YYText.

Features

• UILabel API compatible
• AutoLayout supported
• Renders using TextKit, so handles all the text attributes. eg. NSAttachmentAttributeName, NSStrikethroughStyleAttributeName, NSUnderlineStyleAttributeName etc.
• High performance asynchronous text layout and rendering
• Text attachments with UIImage, UIView and CALayer
• Exclusion paths
• Custom attributes
• Custom truncation token
• Debug text layout
• Text selection

Requirements

• iOS 10+

Installation

MPITextKit supports multiple methods for installing the library in a project.

Installation with CocoaPods

pod 'MPITextKit'

Installation with Swift Package Manager

Once you have your Swift package set up, adding MPITextKit as a dependency is as easy as adding it to the dependencies value of your Package.swift.

dependencies: [
    .package(url: "https://github.com/meitu/MPITextKit.git")
]

Installation with Carthage

Carthage is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks. To integrate MPITextKit, add the following to your Cartfile.

github "meitu/MPITextKit"

Usage

Basic

MPILabel *label = [MPILabel new];
label.text = @"foo";
label.font = [UIFont systemFontOfSize:16];
label.textAlignment = NSTextAlignmentCenter;
label.textVerticalAlignment = MPITextVerticalAlignmentTop;
label.textColor = [UIColor whiteColor];
label.textContainerInset = UIEdgeInsetsMake(8, 8, 8, 8);

Attributed Text

NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:@"bar"];
    
// Append Attachment.
MPITextAttachment *attachment = [MPITextAttachment new];
attachment.content = [UIImage imageNamed:@"img"];
attachment.verticalAligment = MPITextVerticalAlignmentCenter;
NSAttributedString *attachmetText = [NSAttributedString attributedStringWithAttachment:attachment];
[text appendAttributedString:attachmetText];
    
MPILabel *label = [MPILabel new];
label.numberOfLines = 0;
label.delegate = self; /// Interact Links.

label.attributedText = attributedText;

// Truncation Token ...
label.truncationAttributedToken = MPITextDefaultTruncationAttributedToken(); 

// Additional Truncation Message.
label.additionalTruncationAttributedMessage = [[NSAttributedString alloc] initWithString:@"more" attributes:@{NSForegroundColorAttributeName: [UIColor colorWithRed:0.000 green:0.449 blue:1.000 alpha:1.000], MPITextLinkAttributeName: [MPITextLink new]}];

[label sizeToFit];
label.center = self.view.center;
[self.view addSubview:label];

Size Calculation

NSAttributedString *attributedText = [[NSAttributedString alloc] initWithString:text attributes:@{NSFontAttributeName: [UIFont preferredFontForTextStyle:UIFontTextStyleBody]}];
NSAttributedString *token = MPITextDefaultTruncationAttributedToken();
NSAttributedString *additionalMessage =
[[NSAttributedString alloc] initWithString:@"more" attributes:@{NSForegroundColorAttributeName: [UIColor colorWithRed:0.000 green:0.449 blue:1.000 alpha:1.000], MPITextLinkAttributeName: [MPITextLink new]}];
NSAttributedString *truncationAttriubtedText = MPITextTruncationAttributedTextWithTokenAndAdditionalMessage(attributedText, token, additionalMessage);
CGSize fitsSize = CGSizeMake(CGRectGetWidth(self.view.frame) - 30, CGFLOAT_MAX);
// You can change it for testing
NSUInteger numberOfLines = 5;
    
MPITextRenderAttributes *renderAttributes = [MPITextRenderAttributes new];
renderAttributes.attributedText = attributedText;
renderAttributes.truncationAttributedText = truncationAttriubtedText;
renderAttributes.maximumNumberOfLines = numberOfLines;
// Result of calculation, you can use it do something.
CGSize textSize = MPITextSuggestFrameSizeForAttributes(renderAttributes, fitsSize, UIEdgeInsetsZero);

Debug

MPITextDebugOption *debugOptions = [MPITextDebugOption new];
debugOptions.baselineColor = [[UIColor redColor] colorWithAlphaComponent:0.5];
debugOptions.lineFragmentBorderColor = [[UIColor redColor] colorWithAlphaComponent:0.200];
debugOptions.lineFragmentUsedBorderColor = [UIColor colorWithRed:0.000 green:0.463 blue:1.000 alpha:0.200];
debugOptions.glyphBorderColor = [UIColor colorWithRed:1.000 green:0.524 blue:0.000 alpha:0.200];
[MPITextDebugOption setSharedDebugOption:debugOptions];

Notice

• For multi-line text display in AutoLayout, it is recommended to set the preferredMaxLayoutWidth to improve performance.
• You should not use text and attributedText at the same time.
• When you customize attribute, you should override the - isEqual: and - hash methods.

Reference

• Texture: Smooth asynchronous user interfaces for iOS apps.
• YYText: Powerful text framework for iOS to display and edit rich text.
• STULabel: A faster and more flexible label view for iOS.
• Neat: Fix the line height problems of TextKit.
• Cocoa text system: Introduction to cocoa text system.

License

MPITextKit is released under the MIT license. See LICENSE file for details.