拆分归属字符串并保留格式 [英] Split Attributed String and Retain Formatting

问题描述

如何在维护格式的同时，根据预定义的分隔符获取现有的NSAttributedString并将其划分？看起来componentsSeparatedByString似乎不会对NSAttributedString进行操作。

How can you take an existing NSAttributedString and divide it based on a predefined separator while maintaining formatting? It does not seem that componentsSeparatedByString will operate on an NSAttributedString.

我当前的解决方法会在正确的点生成拆分，但只输出NSString。因此失去格式。

My current workaround produces the splits at the correct points, but only outputs an NSString. Thus losing formatting.

NSData *rtfFileData = [NSData dataWithContentsOfFile:path];
NSAttributedString *rtfFileAttributedString = [[NSAttributedString alloc] initWithData:rtfFileData options:@{NSDocumentTypeDocumentAttribute:NSRTFTextDocumentType} documentAttributes:nil error:nil];
NSString *rtfFileString = [rtfFileAttributedString string];
NSString *importSeparator = @"###";
// Wish I could do this
// NSArray *separatedArray = [rtfFileAttributedString componentsSeparatedByString:importSeparatorPref];
NSArray *separatedArray = [rtfFileString componentsSeparatedByString:importSeparatorPref];
NSLog( @"Separated array: %@", separatedArray );

推荐答案

您可以使用拆分非属性字符串拆分属性字符串。一种选择是：

You can make use of your split non-attributed string to split up the attributed string. One option would be:

NSData *rtfFileData = [NSData dataWithContentsOfFile:path];
NSAttributedString *rtfFileAttributedString = [[NSAttributedString alloc] initWithData:rtfFileData options:@{NSDocumentTypeDocumentAttribute:NSRTFTextDocumentType} documentAttributes:nil error:nil];
NSString *rtfFileString = [rtfFileAttributedString string];
NSString *importSeparator = @"###";
NSArray *separatedArray = [rtfFileString componentsSeparatedByString:importSeparatorPref];

NSMutableArray *separatedAttributedArray = [NSMutableArray arrayWithCapacity:separatedArray.count];
NSInteger start = 0;
for (NSString *sub in separatedArray) {
    NSRange range = NSMakeRange(start, sub.length);
    NSAttributedString *str = [rtfFileAttributedString attributedSubstringFromRange:range];
    [separatedAttributedArray addObject:str];
    start += range.length + importSeparator.length;
}

NSLog(@"Separated attributed array: ", separatedAttributedArray);

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