ios 使用 drawInRect:withAttributes 对齐文本：
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align text using drawInRect:withAttributes:
提问by StephenAshley.developer
In the iOS 5 version of my app I had:
在我的应用程序的 iOS 5 版本中，我有：
[self.text drawInRect: stringRect
withFont: [UIFont fontWithName: @"Courier" size: kCellFontSize]
lineBreakMode: NSLineBreakByTruncatingTail
alignment: NSTextAlignmentRight];
I'm upgrading for iOS 7. The above method is deprecated. I'm now using drawInRect:withAttributes:. The attributesparameter is an NSDictionary object. I can get drawInRect:withAttributes:to work for the former fontparameter using this:
我正在升级 iOS 7。不推荐使用上述方法。我现在使用drawInRect:withAttributes:。的属性参数是一个NSDictionary对象。我可以使用以下命令让drawInRect:withAttributes:为以前的字体参数工作：
UIFont *font = [UIFont fontWithName: @"Courier" size: kCellFontSize];
NSDictionary *dictionary = [[NSDictionary alloc] initWithObjectsAndKeys: font, NSFontAttributeName,
nil];
[self.text drawInRect: stringRect
withAttributes: dictionary];
What key-value pairs do I add to dictionaryto get NSLineBreakByTruncatingTailand NSTextAlignmentRight?
我将哪些键值对添加到字典以获得NSLineBreakByTruncatingTail和NSTextAlignmentRight？
回答by Hejazi
There is one key to set the paragraph style of the text (including line breaking mode, text alignment, and more).
一键设置文本的段落样式（包括换行模式、文本对齐方式等）。
From docs:
从文档：
NSParagraphStyleAttributeNameThe value of this attribute is an
NSParagraphStyleobject. Use this attribute to apply multiple attributes to a range of text. If you do not specify this attribute, the string uses the default paragraph attributes, as returned by thedefaultParagraphStylemethod ofNSParagraphStyle.
NSParagraphStyleAttributeName该属性的值是一个
NSParagraphStyle对象。使用此属性可将多个属性应用于一系列文本。如果不指定此属性，则字符串使用默认段落属性，如 的defaultParagraphStyle方法返回的那样NSParagraphStyle。
So, you can try the following:
因此，您可以尝试以下操作：
UIFont *font = [UIFont fontWithName:@"Courier" size:kCellFontSize];
/// Make a copy of the default paragraph style
NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
/// Set line break mode
paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;
/// Set text alignment
paragraphStyle.alignment = NSTextAlignmentRight;
NSDictionary *attributes = @{ NSFontAttributeName: font,
NSParagraphStyleAttributeName: paragraphStyle };
[text drawInRect:rect withAttributes:attributes];
回答by Darius Miliauskas
The code is going that way:
代码是这样的：
CGRect textRect = CGRectMake(x, y, length-x, maxFontSize);
UIFont *font = [UIFont fontWithName:@"Courier" size:maxFontSize];
NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;
paragraphStyle.alignment = NSTextAlignmentRight;
NSDictionary *attributes = @{ NSFontAttributeName: font,
NSParagraphStyleAttributeName: paragraphStyle,
NSForegroundColorAttributeName: [UIColor whiteColor]};
[text drawInRect:textRect withAttributes:attributes];
