Question

Now i need to change the alignment of a paragraph in a nstextview without select it ,so i need to know the range of the current range of the paragraph?

Answer 1

I have a subclass of NSTextView so you need to access textStorage and selectedRange different than [self textStorage] and [self selectedRange].

NSTextStorage *textStorage = [self textStorage];
NSString *string = [textStorage string];

NSUInteger editEnd = [self selectedRange].location;
NSUInteger editStart = editEnd-[textStorage editedRange].length;
NSUInteger maxLength = [string length];


while (editStart > 0) {
    unichar theChr = [string characterAtIndex:editStart-1];
    if( theChr == '\n' || theChr == '\r' ) {
        break;
    }
    --editStart;
}
while (editEnd < maxLength) {
    unichar theChr = [string characterAtIndex:editEnd];
    if( theChr == '\n' || theChr == '\r' ) {
        break;
    }
    ++editEnd;
}

NSRange paragraphRange = NSMakeRange(editStart, editEnd-editStart);