如何在NSAttributedString中将字符大小写改为Upper [英] how to change characters case to Upper in NSAttributedString

问题描述

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，

//将输入字符串的一个可变拷贝$（$）$ {
} b $ b NSMutableAttributedString * attrString = [inAttrString mutableCopy];

//创建一个数组来保存属性
NSMutableArray * attributes = [NSMutableArray array];

//将每一组属性添加到包含属性和范围的字典数组中
[attrString enumerateAttributesInRange：NSMakeRange（0，[attrString length]）options：0 usingBlock：^ NSDictionary * attrs，NSRange range，BOOL * stop）{
[attributes addObject：@ {@attrs：attrs，@range：[NSValue valueWithRange：range]}];
}];

//创建一个大写字符串
NSString * string = [[attrString string] uppercaseString];

//用大写字符替换字符
[attrString replaceCharactersInRange：NSMakeRange（0，[attrString length]）withString：string];

//重新应用每个属性
for（NSDictionary * attribute in attributes）{
[attrString setAttributes：attribute [@attrs] range：[attribute [@range ] rangeValue]];
}

return attrString;
}

这是做什么的：

1. 制作输入属性字符串的可变副本。


2. 从该字符串获取所有属性，并将其放入数组中，以便以后使用。


3. 使用内置的 NSString 方法创建大写纯文本字符串。


4. 应用所有属性。

I want to convert NSAttributedString containing RTFD to uppercase without losing attributes of existing characters and graphics.

Thanks,

解决方案

- (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;
}

What this does:

1. Makes a mutable copy of the input attributed string.
2. Takes all the attributes from that string and puts them in an array so they can be used later.
3. Makes an uppercase plain string using built-in NSString method.
4. Re-applys all the attributes.

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