替换uitextview的布局管理器 [英] replace layout manager of uitextview

问题描述

Mac OS X上的NSTextContainer有一个方法replaceLayoutManager：用NSLayoutManager的子类替换NSTextView的NSLayoutManager。

NSTextContainer on Mac OS X has a method replaceLayoutManager: to replace the NSLayoutManager of NSTextView with a subclass of NSLayoutManager.

不幸的是，iOS没有这样的功能。
我尝试了这些代码行的组合，但它一直在崩溃。

Unfortunately iOS doesn't have such a function. I tried a combination of these lines of code, but it keeps crashing.

THLayoutManager *layoutManager = [[THLayoutManager alloc] init];
    [layoutManager addTextContainer:[self textContainer]];

    //      [[self textStorage] removeLayoutManager:[self layoutManager]];
    //[[self textStorage] addLayoutManager:layoutManager];
    [[self textContainer] setLayoutManager:layoutManager];

更换UITextview的NSLayoutManager的正确程序是什么？

What is the correct procedure to replace the NSLayoutManager of an UITextview?

推荐答案

查看WWDC2013 Intro To Text Kit视频和示例代码，了解如何操作。

Have a look at the WWDC2013 Intro To Text Kit video and sample code where they show how to do it.

https://developer.apple.com/downloads/index .action？name = WWDC％202013
https://developer.apple。 com / wwdc / videos /

以下是代码摘录

-(void)viewDidLoad
{
    [super viewDidLoad];

    // our auto layout views use a design spec that calls for
    // 8 pts on each side except the bottom
    // since we scroll at the top here, only inset the sides

    CGRect newTextViewRect = CGRectInset(self.view.bounds, 8., 0.);

    self.textStorage = [[TKDInteractiveTextColoringTextStorage alloc] init];

    NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];

    NSTextContainer *container = [[NSTextContainer alloc] initWithSize:CGSizeMake(newTextViewRect.size.width, CGFLOAT_MAX)];
    container.widthTracksTextView = YES;
    [layoutManager addTextContainer:container];
    [_textStorage addLayoutManager:layoutManager];

    UITextView *newTextView = [[UITextView alloc] initWithFrame:newTextViewRect textContainer:container];
    newTextView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
    newTextView.scrollEnabled = YES;
    newTextView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;

    [self.view addSubview:newTextView];
    self.textView = newTextView;

    self.textStorage.tokens = @{ @"Alice" : @{ NSForegroundColorAttributeName : [UIColor redColor] },
                                 @"Rabbit" : @{ NSForegroundColorAttributeName : [UIColor orangeColor] },
                                 TKDDefaultTokenName : @{ NSForegroundColorAttributeName : [UIColor blackColor] } };
}

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