iphone - CoreText 文本水平居中对齐

Question

我正在使用 CoreText 并且我想让我的 NSMutableAttributedString 始终居中对齐其文本。这是我正在使用的代码，但它不起作用:

CTTextAlignment paragraphAlignment = kCTCenterTextAlignment;
    CTParagraphStyleSetting paragraphSettings[1] = {{kCTParagraphStyleSpecifierAlignment, sizeof(CTTextAlignment), &paragraphAlignment}};
CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(paragraphSettings, 1);

text = [[NSMutableAttributedString alloc] initWithString:@"" attributes:[NSDictionary dictionaryWithObjectsAndKeys: (id)paragraphStyle, (NSString*)kCTParagraphStyleAttributeName, nil]];

有谁知道如何正确执行此操作？

Answer 1

如果您的应用兼容 10.10 或更高版本，则不使用 CoreText 的其他解决方案是使用 NSParagraphStyle。

NSMutableParagraphStyle *rectStyle = NSMutableParagraphStyle.defaultParagraphStyle.mutableCopy;
rectStyle.lineBreakMode = NSLineBreakByClipping;
rectStyle.alignment = NSTextAlignmentCenter;

NSMutableAttributedString *att = [[NSMutableAttributedString alloc] initWithString:myText attributes:@{NSParagraphStyleAttributeName : rectStyle}];