UITextView where should I set color and font for for attributed string

问题

When I use UITextView in storyboard, I can select text as attributed string and set its attributes like color, font and other attributes. And when I set textView.text = @"my string" in code it show up as I set.

My question is if I want to do this in code, what would be equivalent to this storyboard attributes setting? From document https://developer.apple.com/library/ios/documentation/UIKit/Reference/UITextView_Class/index.html#//apple_ref/occ/instp/UITextView/text I see some property i.e. textColor, font, but lack of some property that I can set like line-height.

回答1:

This is done via the attributed strings object! You should definitely have a look at the programming guide: https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/AttributedStrings/AttributedStrings.html

Upon request, a short example to show how you create an attributed string.

- (void)viewDidLoad
{
    [super viewDidLoad];

    //
    // Example 1: Create attributed string and set attributes for ranges
    //
    NSString *plainString = @"Hello World";
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:plainString];

    // change the font of the entire string
    [attributedString addAttribute:NSFontAttributeName
                             value:[UIFont fontWithName:@"Courier New" size:16.0]
                             range:NSMakeRange(0, plainString.length)];

    // set the font color to blue for the word 'World'
    [attributedString addAttribute:NSForegroundColorAttributeName
                             value:[UIColor blueColor]
                             range:NSMakeRange(6, 4)];
    // assign to texfield 1
    self.tfAttributedString1.attributedText = attributedString;

    //
    // Example 2: Create attributed string based on html
    //
    NSString *htmlString = @"<p style='font-family:Courier New'>Hello <span style='color:blue'>html</span></p>";
    NSData *htmlStringData = [htmlString dataUsingEncoding:NSUTF8StringEncoding];
    NSDictionary *attributedStringOptions = @{
                                              NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType,
                                              NSCharacterEncodingDocumentAttribute: @(NSUTF8StringEncoding)
                                              };
    // assign to texfield 2
    self.tfAttributedString2.attributedText = [[NSAttributedString alloc] initWithData:htmlStringData
                                                                               options: attributedStringOptions
                                                                    documentAttributes:nil error:nil];
}

And this is what the result will look like:

来源：https://stackoverflow.com/questions/28591010/uitextview-where-should-i-set-color-and-font-for-for-attributed-string

标签

ios

uitextview

nsattributedstring