Cocoa 如何将NSAttributedString中的字符大小写更改为大写
我想将包含RTFD的NSAttributedString转换为大写,而不会丢失现有字符和图形的属性 谢谢,编辑: @fluidsonic是正确的,因为原始代码不正确。下面是Swift中的更新版本,它将每个属性范围中的文本替换为该范围中字符串的大写版本Cocoa 如何将NSAttributedString中的字符大小写更改为大写,cocoa,character,uppercase,nsattributedstring,Cocoa,Character,Uppercase,Nsattributedstring,我想将包含RTFD的NSAttributedString转换为大写,而不会丢失现有字符和图形的属性 谢谢,编辑: @fluidsonic是正确的,因为原始代码不正确。下面是Swift中的更新版本,它将每个属性范围中的文本替换为该范围中字符串的大写版本 extension NSAttributedString { func uppercased() -> NSAttributedString { let result = NSMutableAttributedStr
extension NSAttributedString {
func uppercased() -> NSAttributedString {
let result = NSMutableAttributedString(attributedString: self)
result.enumerateAttributes(in: NSRange(location: 0, length: length), options: []) {_, range, _ in
result.replaceCharacters(in: range, with: (string as NSString).substring(with: range).uppercased())
}
return result
}
}
原始答复:
它的作用是:
NSString
方法生成大写纯字符串代码不正确。它可能会生成属性字符串,其中属性被关闭了几个字符,甚至可能崩溃。该方法取决于初始字符串和大写字符串是否具有相同的字符数。但根据“Case变换不能保证对称,也不能产生与原始字符串长度相同的字符串”。
- (NSAttributedString *)upperCaseAttributedStringFromAttributedString:(NSAttributedString *)inAttrString {
// Make a mutable copy of your input string
NSMutableAttributedString *attrString = [inAttrString mutableCopy];
// Make an array to save the attributes in
NSMutableArray *attributes = [NSMutableArray array];
// Add each set of attributes to the array in a dictionary containing the attributes and range
[attrString enumerateAttributesInRange:NSMakeRange(0, [attrString length]) options:0 usingBlock:^(NSDictionary *attrs, NSRange range, BOOL *stop) {
[attributes addObject:@{@"attrs":attrs, @"range":[NSValue valueWithRange:range]}];
}];
// Make a plain uppercase string
NSString *string = [[attrString string]uppercaseString];
// Replace the characters with the uppercase ones
[attrString replaceCharactersInRange:NSMakeRange(0, [attrString length]) withString:string];
// Reapply each attribute
for (NSDictionary *attribute in attributes) {
[attrString setAttributes:attribute[@"attrs"] range:[attribute[@"range"] rangeValue]];
}
return attrString;
}