IOS - How to use `NSMutableString` in swift
I've seen this Objective-C code, but I'm trying to do the same in swift:
NSMutableAttributedString *res = [self.richTextEditor.attributedText mutableCopy];
[res beginEditing];
__block BOOL found = NO;
[res enumerateAttribute:NSFontAttributeName inRange:NSMakeRange(0, res.length) options:0 usingBlock:^(id value, NSRange range, BOOL *stop) {
if (value) {
UIFont *oldFont = (UIFont *)value;
UIFont *newFont = [oldFont fontWithSize:oldFont.pointSize * 2];
[res removeAttribute:NSFontAttributeName range:range];
[res addAttribute:NSFontAttributeName value:newFont range:range];
found = YES;
}
}];
if (!found) {
// No font was found - do something else?
}
[res endEditing];
self.richTextEditor.attributedText = res;
I am trying to change fonts in NSMutableAttributedString
, iterating over each of the attributes. I am more than happy to hear that there is a better way, but if someone can help me translate the above, I would be more than great.
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Here's a basic implementation. This seemed pretty straightforward to me and you haven't submitted your attempt, so I'm not sure if you have something like this and have a problem with it, or if you're just new to Swift.
One difference is that this implementation uses optional casting ( as?
), which I did to demonstrate the concept. In practice, this is not necessary as it is NSFontAttributeName
guaranteed to provide UIFont
.
var res : NSMutableAttributedString = NSMutableAttributedString(string: "test");
res.beginEditing()
var found = false
res.enumerateAttribute(NSFontAttributeName, inRange: NSMakeRange(0, res.length), options: NSAttributedStringEnumerationOptions(0)) { (value, range, stop) -> Void in
if let oldFont = value as? UIFont {
let newFont = oldFont.fontWithSize(oldFont.pointSize * 2)
res.removeAttribute(NSFontAttributeName, range: range)
res.addAttribute(NSFontAttributeName, value: newFont, range: range)
found = true
}
}
if found == false {
}
res.endEditing()
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Hope it helps!
var res : NSMutableAttributedString = self.richTextEditor.attributedText!
res.beginEditing()
var found : bool = false;
res.enumerateAttribute(NSFontAttributeName,inRange:NSMakeRange(0, res.length),options:0, usingBlock(value:AnyObject!, range:NSRange, stop:UnsafeMutablePointer<ObjCBool>) -> Void in {
if (value) {
let oldFont = value as UIFont;
let newFont = oldFont.fontWithSize(oldFont.pointSize * 2)
res.removeAttribute(NSFontAttributeName , range:range)
res.addAttribute(NSFontAttributeName value:newFont range:range)
found = true
}
})
if !found {
// No font was found - do something else?
}
res.endEditing()
self.richTextEditor.attributedText = res;
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