Colour of a substring in a string of text view - ios

Question

I have text view like:
UITextview staticTxt = [[UITextView alloc]initWithFrame:CGRectMake(10, 80, 300, 400)];
staticTxt.backgroundColor = [UIColor clearColor];
staticTxt.text = #"this is a textview";
staticTxt.textColor = [UIColor whiteColor];
[self.view addSubview:staticTxt];
Now what i want is text "textview" should be in some different colour. How can i do this?
Thanks!!

Answer 1

You need to create an attributed text string, as described in this answer:
Underline text in a UITextView

Answer 2

First of all,You have to break your string into substrings. As you said in your comment,""this is a" is in white and "textview" is in red"... Am going to suggest you a way in that reference.
staticTxt.text = #"this is a textview";
NSString *yourString = staticTxt.text;
NSString *str = [[yourString componentsSeparatedByString:#"a "] lastObject];
Now you can set color of "str" substring.
Let me tell you one thing very clearly.It is way only to change substring color of static string.. If you are going to change the text of your textview dynamically... then this method is not a good choice...

Answer 3

You can use different color , different font and different size text in your control(UILabel, UITextField or UItextView) by using this class method
+ (void)setMultiColorAndFontText:(NSString *)text rangeString:(NSArray *)rangeString inputView:(UITextView*) inputView font:(NSArray*) fontName color:(NSArray*) colorName
{
inputView.layer.sublayers = nil;
NSMutableAttributedString *mutableAttributedString = [[ NSMutableAttributedString alloc]initWithString:text];
for (int i =0 ; i<[rangeString count]; i++)
{
CTFontRef ctFont = CTFontCreateWithName((__bridge CFStringRef) [UIFont fontWithName:[fontName objectAtIndex:i] size:14.0].fontName, [UIFont fontWithName:[fontName objectAtIndex:i] size:14.0].pointSize, NULL);
NSRange whiteRange = [text rangeOfString:[rangeString objectAtIndex:i]];
if (whiteRange.location != NSNotFound)
{
[mutableAttributedString addAttribute:(NSString *)kCTForegroundColorAttributeName value:(id)[colorName objectAtIndex:i] range:whiteRange];
[mutableAttributedString addAttribute:(NSString*)kCTFontAttributeName
value:( __bridge id)ctFont
range:whiteRange];
}
}
CGSize expectedinputViewSize = [text sizeWithFont:[UIFont fontWithName:#"Helvetica" size:14.0f] constrainedToSize:CGSizeMake(186,100) lineBreakMode:UILineBreakModeWordWrap];
CATextLayer *textLayer = [[CATextLayer alloc]init];
textLayer.frame =CGRectMake(0,4, inputView.frame.size.width,expectedinputViewSize.height+4);
textLayer.contentsScale = [[UIScreen mainScreen] scale];
textLayer.string=mutableAttributedString;
textLayer.opacity = 1.0;
textLayer.alignmentMode = kCAAlignmentLeft;
[inputView.layer addSublayer:textLayer];
[textLayer setWrapped:TRUE];
[inputView setText:#""];
}
Here you can pass your text , its range , font and color as parameters.
Example :
[CommonFunctions setMultiColorAndFontText:#"This is a textview" rangeString:[NSArray arrayWithObjects:#"This is a",#"textview", nil] textfield:txtEmailAddress font:[NSArray arrayWithObjects:#"Arial",#"Helvetica",nil] color:[NSArray arrayWithObjects:(UIColor *)[UIColor whiteColor].CGColor,(UIColor *)[UIColor redColor].CGColor,nil]];
It will display text with different color and different font.
Note : In this method we have used UITextView . If you need UILabel or UITextField then you just need to change it in same way like:
UILabel
+ (void)setMultiColorAndFontText:(NSString *)text rangeString:(NSArray *)rangeString inputView:(UILabel*) label font:(NSArray*) fontName color:(NSArray*) colorName;
UITextField
+ (void)setMultiColorAndFontText:(NSString *)text rangeString:(NSArray *)rangeString inputView:(UITextField*) label font:(NSArray*) fontName color:(NSArray*) colorName;
UITextView
+ (void)setMultiColorAndFontText:(NSString *)text rangeString:(NSArray *)rangeString inputView:(UITextView*) label font:(NSArray*) fontName color:(NSArray*) colorName;
Hope it helps you.