NSLayoutManager可以与NSTextStorage和NSTextContainer结合使用来创建高级文本动画.他们不说怎么样
我想使用NSLayoutManager / NSTextStorage / NSTextContainer创建自定义文本动画.简单来说,我想为个体字形的大小和位置设置动画,并且褪色并且不符合特定的字形.
似乎没有专门的方法和文档的NSLayoutManager的动画和唯一的教程,我发现is here.但是,它显示了如何将NSLayoutManager攻击到动画,而不是如何使用它应该被使用的方式(他们为每个单个字形创建CATextLayer！).
有人可以指出我正确的方向吗？我知道如何使用NSLayoutManager / NSTextStorage / NSTextContainer渲染静态文本.一些演示,显示使用NSLayoutManager动画文本的原理将是完美的.只是为了让我开始,我可以自己弄清楚细节.
解决方法
1)NSTextContainer：
The NSTextContainer class defines a region in which text is laid out.
An NSTextContainer object defines rectangular regions,and you can define exclusion paths inside the textcontainer’sboundingrectanglesothattextflowsaroundtheexclusionpathasitislaidout.
2)NSLayoutManager
An NSLayoutManager object coordinates the layout and display of characters held in an NSTextStorage object. It maps Unicode character codes to glyphs,sets the glyphs in a series of NSTextContainer objects,and displays them in a series of text view objects.
3)NSTextStorage：
NSTextStorage is a semiconcrete subclass of NSMutableAttributedString that manages a set of client NSLayoutManagerobjects,notifyingthemofanychangestoitscharactersorattributessothattheycanrelay and redisplay the text as needed.
我们可以知道NSTextStorage可以存储和管理UITextView的文本,它是NSMutableAttributedString的子类.我们可以添加或修改属性,因此它是存储和管理UITextView文本的不错选择.
NSLayoutManager用于管理NSTextStorage布局的内容.
NSTextContainer提供一个矩形来隐藏布局文本.
我们可以简单地使用它们：
CGRect textViewRect = CGRectInset(self.view.bounds,10.0,20.0); // NSTextContainer NSTextContainer *container = [[NSTextContainer alloc] initWithSize:CGSizeMake(textViewRect.size.width,CGFLOAT_MAX)]; // new in iOS 7.0 container.widthTracksTextView = YES; // Controls whether the receiveradjusts the width of its bounding rectangle when its text view is resized // NSLayoutManager NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init]; // new in iOS 7.0 [layoutManager addTextContainer:container]; // NSTextStorage subclass self.textStorage = [[TextStorage alloc] init]; // new in iOS 7.0 [self.textStorage addLayoutManager:layoutManager];
首先是创建它们的实例,并创建它们的关系.你必须通过initWithFrame：textContainer：method在UITextView中添加NSTextContainer.
// UITextView UITextView *newTextView = [[UITextView alloc] initWithFrame:textViewRect textContainer:container]; newTextView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth; newTextView.scrollEnabled = YES; newTextView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag; // newTextView.editable = NO; newTextView.font = [UIFont fontWithName:self.textStorage.fontName size:18.0]; newTextView.dataDetectorTypes = UIDataDetectorTypeAll; self.textView = newTextView; [self.view addSubview:self.textView];
如果要使用UITextStorage来更改文本属性,可以使用：
[_textStorage beginEditing]; // begin edit [_textStorage endEditing]; // end edit
在它们之间,您可以编辑文本,如：
[_textStorage beginEditing];
NSDictionary *attrsDic = @{NSTextEffectAttributeName: NSTextEffectLetterpressStyle};
UIKIT_EXTERN NSString *const NSTextEffectAttributeName NS_AVAILABLE_IOS(7_0); // NSString,default nil: no text effect
NSMutableAttributedString *mutableAttrString = [[NSMutableAttributedString alloc] initWithString:@"Letterpress" attributes:attrsDic];
NSAttributedString *appendAttrString = [[NSAttributedString alloc] initWithString:@" Append:Letterpress"];
[mutableAttrString appendAttributedString:appendAttrString];
[_textStorage setAttributedString:mutableAttrString];
[_textStorage endEditing];
或更改颜色：
[_textStorage beginEditing];
/* Dynamic Coloring Text */
self.textStorage.bookItem = [[BookItem alloc] initWithBookName:@"Dynamic Coloring.rtf"];
self.textStorage.tokens = @{@"Alice": @{NSForegroundColorAttributeName: [UIColor redColor]},@"Rabbit": @{NSForegroundColorAttributeName: [UIColor greenColor]},DefaultTokenName: @{NSForegroundColorAttributeName: [UIColor blackColor]}
};
[_textStorage setAttributedString:_textStorage.bookItem.content];
[_textStorage endEditing];
