我正在尝试检测字符串中的网站 URL，然后执行一些归因字符串操作，例如将其加粗等。
我的正则表达式定义为：
static NSRegularExpression *websiteRegularExpression;
static inline NSRegularExpression * WebsiteRegularExpression() {
if (!websiteRegularExpression) {
websiteRegularExpression = [[NSRegularExpression alloc] initWithPattern:@"\b(https?|ftp|file)://[-A-Z0-9+&@#/%?=~_|!:,.;]*[A-Z0-9+&@#/%=~_|]"
options:NSRegularExpressionCaseInsensitive
error:nil];
}
return websiteRegularExpression;
}
这里我列举一下：
-(void)setBodyText
{
__block NSRegularExpression *regexp = nil;
bodyLabel.delegate = self;
[self.bodyLabel setText:@"http://www.google.com" afterInheritingLabelAttributesAndConfiguringWithBlock:^NSAttributedString *(NSMutableAttributedString *mutableAttributedString) {
NSRange stringRange = NSMakeRange(0, [mutableAttributedString length]);
regexp = WebsiteRegularExpression ();
NSRange nameRange = [regexp rangeOfFirstMatchInString:[mutableAttributedString string] options:0 range:stringRange];
UIFont *boldSystemFont = [UIFont boldSystemFontOfSize:18.0];
CTFontRef boldFont = CTFontCreateWithName((CFStringRef)boldSystemFont.fontName, boldSystemFont.pointSize, NULL);
if (boldFont) {
[mutableAttributedString addAttribute:(NSString *)kCTFontAttributeName value:(id)boldFont range:nameRange];
CFRelease(boldFont);
}
[mutableAttributedString replaceCharactersInRange:nameRange withString:[[[mutableAttributedString string] substringWithRange:nameRange] uppercaseString]];
return mutableAttributedString;
}];
regexp = WebsiteRegularExpression();
NSRange linkRange = [regexp rangeOfFirstMatchInString:self.bodyLabel.text options:0 range:NSMakeRange(0, [bodyLabel.text length])];
[self.bodyLabel addLinkToURL:nil withRange:linkRange];
}
我收到错误：
*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSCFString substringWithRange:]: Range or index out of bounds'
我该如何解决？
检查内容名称范围在你打电话之前带范围的子串。如果您的正则表达式不匹配，则返回值第一个匹配字符串范围 http://developer.apple.com/library/iOS/#documentation/Foundation/Reference/NSRegularExpression_Class/Reference/Reference.html#//apple_ref/occ/instm/NSRegularExpression/rangeOfFirstMatchInString%3aoptions%3arange%3a将
{NSNotFound，0}
NS未找到 http://developer.apple.com/library/mac/#documentation/cocoa/reference/foundation/Miscellaneous/Foundation_Constants/Reference/reference.html#//apple_ref/doc/c_ref/NSNotFound定义为NS整数最大值所以你可以想象为什么这个值可能超出你的范围可变属性字符串.
更新评论
所以要检查结果带范围的子串:
if (nameRange.location == NSNotFound)
// didn't match the WebsiteRegularExpression() do something else
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