NSMutableAttributedString知道在哪个文本上更改颜色

Question

I am doing tagging feature like facebook and I can tag user already. I can show like this. It is done by this code.

NSMutableAttributedString * string = [[NSMutableAttributedString alloc]initWithString:self.textView.text];

for (NSString *word in self.tagNameCollection) {
    [string addColor:[UIColor redColor] substring:word];
    [string addBackgroundColor:[Helpers getFromRGB:135 green:206 blue:250] substring:word];
}

So, I have NSMutableAttributedString. Can I know where I have changed colour, font from my NSMutableAttributedString? May I know how to do?

Answer 1

You can use enumerateAttributesInRange:options:usingBlock: to get what are the attributes of your NSAttributedString .

Example:

[attributedString enumerateAttributesInRange:NSMakeRange(0, [attributedString length])
                                     options:0
                                  usingBlock:^(NSDictionary *attributes, NSRange range, BOOL *stop) {
if ([attributes objectForKey:NSForegroundColorAttributeName])
    NSLog(@"Found ForeGround Color: %@ in range %@", [attributes objectForKey:NSForegroundColorAttributeName], NSStringFromRange(range));
if ([attributes objectForKey:NSFontAttributeName])
    NSLog(@"Found Font: %@ in range %@", [attributes objectForKey:NSFontAttributeName], NSStringFromRange(range));
if ([attributes objectForKey:NSBackgroundColorAttributeName])
    NSLog(@"Found Background Color: %@ in range %@", [attributes objectForKey:NSBackgroundColorAttributeName], NSStringFromRange(range));

}];