我正在学习NodeJS，我使用- (NSTextStorage *)textStorage
{
if (!_textStorage)
{
_textStorage = [[NSTextStorage alloc] init];
[_textStorage addLayoutManager:self.layoutManager];
[self.layoutManager setTextStorage:_textStorage];
}
return _textStorage;
}
- (NSTextContainer *)textContainer
{
if (!_textContainer)
{
_textContainer = [[NSTextContainer alloc] init];
_textContainer.lineFragmentPadding = 0;
_textContainer.maximumNumberOfLines = self.numberOfLines;
_textContainer.lineBreakMode = self.lineBreakMode;
_textContainer.widthTracksTextView = YES;
_textContainer.size = self.frame.size;
[_textContainer setLayoutManager:self.layoutManager];
}
return _textContainer;
}
- (NSLayoutManager *)layoutManager
{
if (!_layoutManager)
{
// Create a layout manager for rendering
_layoutManager = [[PRYLayoutManager alloc] init];
_layoutManager.delegate = self;
[_layoutManager addTextContainer:self.textContainer];
}
return _layoutManager;
}
- (void)layoutSubviews
{
[super layoutSubviews];
// Update our container size when the view frame changes
self.textContainer.size = self.bounds.size;
}
- (void)setFrame:(CGRect)frame
{
[super setFrame:frame];
CGSize size = frame.size;
size.width = MIN(size.width, self.preferredMaxLayoutWidth);
size.height = 0;
self.textContainer.size = size;
}
- (void)setBounds:(CGRect)bounds
{
[super setBounds:bounds];
CGSize size = bounds.size;
size.width = MIN(size.width, self.preferredMaxLayoutWidth);
size.height = 0;
self.textContainer.size = size;
}
- (void)setPreferredMaxLayoutWidth:(CGFloat)preferredMaxLayoutWidth
{
[super setPreferredMaxLayoutWidth:preferredMaxLayoutWidth];
CGSize size = self.bounds.size;
size.width = MIN(size.width, self.preferredMaxLayoutWidth);
self.textContainer.size = size;
}
- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines
{
// Use our text container to calculate the bounds required. First save our
// current text container setup
CGSize savedTextContainerSize = self.textContainer.size;
NSInteger savedTextContainerNumberOfLines = self.textContainer.maximumNumberOfLines;
// Apply the new potential bounds and number of lines
self.textContainer.size = bounds.size;
self.textContainer.maximumNumberOfLines = numberOfLines;
// Measure the text with the new state
CGRect textBounds;
@try
{
NSRange glyphRange = [self.layoutManager
glyphRangeForTextContainer:self.textContainer];
textBounds = [self.layoutManager boundingRectForGlyphRange:glyphRange
inTextContainer:self.textContainer];
// Position the bounds and round up the size for good measure
textBounds.origin = bounds.origin;
textBounds.size.width = ceilf(textBounds.size.width);
textBounds.size.height = ceilf(textBounds.size.height);
}
@finally
{
// Restore the old container state before we exit under any circumstances
self.textContainer.size = savedTextContainerSize;
self.textContainer.maximumNumberOfLines = savedTextContainerNumberOfLines;
}
return textBounds;
}
- (void)setAttributedText:(NSAttributedString *)attributedText
{
// Pass the text to the super class first
[super setAttributedText:attributedText];
[self.textStorage setAttributedString:attributedText];
}
- (CGPoint)_textOffsetForGlyphRange:(NSRange)glyphRange
{
CGPoint textOffset = CGPointZero;
CGRect textBounds = [self.layoutManager boundingRectForGlyphRange:glyphRange
inTextContainer:self.textContainer];
CGFloat paddingHeight = (self.bounds.size.height - textBounds.size.height) / 2.0f;
if (paddingHeight > 0)
{
textOffset.y = paddingHeight;
}
return textOffset;
}
- (void)drawTextInRect:(CGRect)rect
{
// Calculate the offset of the text in the view
CGPoint textOffset;
NSRange glyphRange = [self.layoutManager glyphRangeForTextContainer:self.textContainer];
textOffset = [self _textOffsetForGlyphRange:glyphRange];
// Drawing code
[self.layoutManager drawBackgroundForGlyphRange:glyphRange atPoint:textOffset];
// for debugging the following 2 line should produce the same results
[self.layoutManager drawGlyphsForGlyphRange:glyphRange atPoint:textOffset];
//[super drawTextInRect:rect];
}
编写了一个脚本。当我运行express-generator时，效果很好：
npm start app.js但是，如果我尝试使用root@server:~ $ npm start app.js
> nodejs@0.0.0 start /root/nodejs
> node ./bin/www "app.js"
或node，则根本不起作用：
nodejs以下是我使用的版本：
root@server:~ $ node app.js
root@server:~ $ node app
root@server:~ $ nodejs app.js
root@server:~ $ nodejs app
root@server:~ $
为什么不起作用？
答案 0 :(得分：1)
对于使用express-generator创建的快速项目，此命令将运行node ./bin/www而不是node app.js。在package.json中，您将看到"scripts": {"start": "node ./bin/www"}，该项目以npm start开始。默认情况下，只有node命令可在终端/ CMD上运行，就像node --version和nodejs一样。 npm是node package manager，在系统上安装nodejs时会被安装。 npm --version将显示npm版本
答案 1 :(得分：0)
请检查您的package.json。启动项目的默认命令是"start"
"scripts": {
"start": "node ./bin/www"
尽管用于node -v的命令是用于节点应用程序的，与项目无关，但我的意思是与项目的脚本有关。
如果可能，请检查此npm start vs node app.js
您应该经历https://developer.mozilla.org/en-US/docs/Learn/Server-side/Express_Nodejs
是Mozilla的开发指南。它将使您更好地理解与表达有关的概念。