拆分属性字符串并保留格式

Question

如何使用现有的 NSAttributedString 并根据预定义的分隔符对其进行划分，同时保持格式不变？ componentsSeparatedByString 似乎不会对 NSAttributedString 进行操作。

我当前的解决方法在正确的点生成拆分，但只输出一个 NSString。从而丢失格式。

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 );

Answer 1

您可以使用拆分的非属性字符串来拆分属性字符串。一种选择是：

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);

Answer 2

在swift中答案很简单。

var string = NSAttributedString(
    string: "This string is shorter than it should be for this questions answer.",
    attributes: [.font: UIFont.systemFont(ofSize: 12)]
)
let range = NSRange(location: 0, length: 120)
let newString = string.attributedSubstring(from: range)
print(newString)

Answer 3

在Swift4中，我做了函数

func splitAttributedString(inputString: NSAttributedString, seperateBy: String) -> [NSAttributedString] {
    let input = inputString.string
    let separatedInput = input.components(separatedBy: seperateBy)
    var output = [NSAttributedString]()
    var start = 0
    for sub in separatedInput {
        let range = NSMakeRange(start, sub.utf16.count)
        let attribStr = inputString.attributedSubstring(from: range)
        output.append(attribStr)
        start += range.length + seperateBy.count
    }
    return output
}

Answer 4

这是一个 NSAttributedString 扩展，其工作方式与此处的其他一些示例类似。

private extension NSAttributedString {
    func components(separatedBy separator: String) -> [NSAttributedString] {
        var result = [NSAttributedString]()
        let separatedStrings = string.components(separatedBy: separator)
        var range = NSRange(location: 0, length: 0)
        for string in separatedStrings {
            range.length = string.utf16.count
            let attributedString = attributedSubstring(from: range)
            result.append(attributedString)
            range.location += range.length + separator.utf16.count
        }
        return result
    }
}

拆分属性字符串并保留格式

Split Attributed String and Retain Formatting

objective-c

nsattributedstring

ios

ios8