ios drawInRect:withAttributes vs drawInRect:withFont:lineBreakMode:alignment
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drawInRect:withAttributes vs drawInRect:withFont:lineBreakMode:alignment
提问by Ross Pirtle
I'm working on a new version of my app and am attempting to replace deprecated messages, but am not able to get past this one.
我正在开发我的应用程序的新版本，并试图替换已弃用的消息，但无法通过此消息。
I can't figure out why drawInRect:withAttributesis not working. The code displays properly when drawInRect:withFont:lineBreakMode:alignmentmessage is sent, but does not work when drawInRect:withAttributesis sent.
我无法弄清楚为什么drawInRect:withAttributes不起作用。该代码在drawInRect:withFont:lineBreakMode:alignment发送消息时正确显示，但在drawInRect:withAttributes发送时不起作用。
I'm using the same rect and font and I what I believe is the same text style. The constants are just positioning the rect just below an image, but I'm using the same rect for both calls, so I'm certain the rectangle is correct.
我使用相同的矩形和字体，我认为是相同的文本样式。常量只是将矩形定位在图像下方，但我对两个调用使用相同的矩形，所以我确定矩形是正确的。
(note that bs.nameused below is an NSString object)
（注意下面使用的bs.name是一个 NSString 对象）
CGRect textRect = CGRectMake(fCol*kRVCiPadAlbumColumnWidth,
kRVCiPadAlbumColumnWidth-kRVCiPadTextLabelYOffset,
kRVCiPadAlbumColumnWidth,
kRVCiPadTextLabelHeight);
NSMutableParagraphStyle *textStyle = [[NSMutableParagraphStyle defaultParagraphStyle] mutableCopy];
textStyle.lineBreakMode = NSLineBreakByWordWrapping;
textStyle.alignment = NSTextAlignmentCenter;
UIFont *textFont = [UIFont systemFontOfSize:16];
This doesn't work (nothing is drawn on the screen) using the variables from above
这不起作用（屏幕上没有绘制任何内容）使用上面的变量
[bs.name drawInRect:textRect
withAttributes:@{NSFontAttributeName:textFont,
NSParagraphStyleAttributeName:textStyle}];
This Does work (the string is drawn properly on the screen) using the same variables from above
这确实有效（字符串在屏幕上正确绘制）使用与上面相同的变量
[bs.name drawInRect:textRect
withFont:textFont
lineBreakMode:NSLineBreakByWordWrapping
alignment:NSTextAlignmentCenter];
Any assistance would be great. Thanks.
任何帮助都会很棒。谢谢。
回答by Hiren
To set the color of text you need to pass the NSForegroundColorAttributeNamein the attribute as the additional parameter.
要设置文本的颜色，您需要NSForegroundColorAttributeName将属性作为附加参数传递。
NSDictionary *dictionary = @{ NSFontAttributeName: self.font,
NSParagraphStyleAttributeName: paragraphStyle,
NSForegroundColorAttributeName: self.textColor};
回答by Arek Holko
I've made a UIViewwith drawRect:containing only the code you provided
我做了一个UIView与drawRect:仅含您所提供的代码
- (void)drawRect:(CGRect)frame
{
NSMutableParagraphStyle *textStyle = [[NSMutableParagraphStyle defaultParagraphStyle] mutableCopy];
textStyle.lineBreakMode = NSLineBreakByWordWrapping;
textStyle.alignment = NSTextAlignmentCenter;
UIFont *textFont = [UIFont systemFontOfSize:16];
NSString *text = @"Lorem ipsum";
// iOS 7 way
[text drawInRect:frame withAttributes:@{NSFontAttributeName:textFont, NSParagraphStyleAttributeName:textStyle}];
// pre iOS 7 way
CGFloat margin = 16;
CGRect bottomFrame = CGRectMake(0, margin, frame.size.width, frame.size.height - margin);
[text drawInRect:bottomFrame withFont:textFont lineBreakMode:NSLineBreakByWordWrapping alignment:NSTextAlignmentCenter];
}
I don't see any difference between the outputs of these two methods. Maybe the problem is somewhere else in your code?
我看不出这两种方法的输出有什么区别。也许问题出在您的代码中的其他地方？
