Question

Html字符串从服务器获取它我尝试转换为属性字符串。使用

NSAttributedString *attributedString = [[NSAttributedString alloc]
                                        initWithData: [htmlString dataUsingEncoding:NSUnicodeStringEncoding]
                                        options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: [NSNumber numberWithInt:NSUTF8StringEncoding] }
                                        documentAttributes: nil
                                        error: nil
                                        ];

具有\ U00002028 \ n的属性字符串会导致显示字符串在文本中获得间距和换行符。如何能够删除此类内容。

Answer 1

修剪NSMutableAttributedString

中的前导和尾随空格

NSString * _strAchievementMsg= @"  Hi Test the White space    ";

NSString * htmlString = [NSString stringWithFormat:@"<html><div>%@</div></html>",_strAchievementMsg];

NSMutableAttributedString *attString = [[NSMutableAttributedString alloc]
                                        initWithData: [htmlString dataUsingEncoding:NSUnicodeStringEncoding]
                                        options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: [NSNumber numberWithInt:NSUTF8StringEncoding] }
                                        documentAttributes: nil
                                        error: nil
                                        ];
NSCharacterSet *charSet = [NSCharacterSet whitespaceAndNewlineCharacterSet];
NSRange range           = [attString.string rangeOfCharacterFromSet:charSet];
while (range.length != 0 && range.location == 0)
{
    [attString replaceCharactersInRange:range withString:@""];
    range = [attString.string rangeOfCharacterFromSet:charSet];
}

// Trim trailing whitespace and newlines.
range = [attString.string rangeOfCharacterFromSet:charSet
                                          options:NSBackwardsSearch];
while (range.length != 0 && NSMaxRange(range) == attString.length)
{
    [attString replaceCharactersInRange:range
                             withString:@""];
    range = [attString.string rangeOfCharacterFromSet:charSet
                                              options:NSBackwardsSearch];
}

Answer 2

NSString *string = [attributedString.string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

仅剥离前导和尾随空格。

NSArray *components = [string componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
string = [components componentsJoinedByString:@""];

Answer 3

在iOS 7中，UIKit添加了一个initWithData：options：documentAttributes：error：方法，它可以使用HTML初始化NSAtttributedString请试试这个

[[NSAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUTF8StringEncoding] 
                                 options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
                                           NSCharacterEncodingDocumentAttribute: @(NSUTF8StringEncoding)} 
                      documentAttributes:nil error:nil];

Html字符串使用\ U00002028 \ n ios转换为属性字符串

3 个答案: