#import "XINBlockTimer.h"

[XINBlockTimer timeBlock:^{

    // For example: time creating an attributed string with HTML //
    NSString *html = @"<style>p {font: 12px HelveticaNeue; text-align: center;}</style><p>This is some <b>bold</b> text.</p>";

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

    label2.attributedText = text;

} withName:@"attributed string from HTML"];

NSTimeInterval t1 = [XINBlockTimer timeBlock:^{ ... }];
NSTimeInterval t2 = [XINBlockTimer timeBlock:^{ ... }];

[XINBlockTimer compareTimeInterval:t1 withTimeInterval:t2];