第5课源代码

//
//  ViewController.m
//  Attributor
//
//  Created by qiuda bin on 15/11/26.
//  Copyright © 2015年 qiuda bin. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UITextView *body;
@property (weak, nonatomic) IBOutlet UILabel *headline;
@property (weak, nonatomic) IBOutlet UIButton *outlineButton;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSMutableAttributedString *title =
    [[NSMutableAttributedString alloc] initWithString:self.outlineButton.currentTitle];
    
    [title setAttributes:@{NSStrokeWidthAttributeName: @3,
                           NSStrokeColorAttributeName: self.outlineButton.tintColor}
                   range:NSMakeRange(0, [title length])];
    [self.outlineButton setAttributedTitle:title forState:UIControlStateNormal];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    [self usePerferredFonts];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(perferredFontsChanged:)
                                                 name:UIContentSizeCategoryDidChangeNotification
                                               object:nil];
}

- (void)perferredFontsChanged:(NSNotification *)notification
{
    [self usePerferredFonts];
}

- (void) usePerferredFonts
{
    self.body.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
    self.headline.font = [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:UIContentSizeCategoryDidChangeNotification
                                                  object:nil];
    
}

- (IBAction)changeBodySelectedColorMatchButtonBackgroundColor:(UIButton *)sender {
    [self.body.textStorage addAttribute:NSForegroundColorAttributeName
                                  value:sender.backgroundColor
                                  range:self.body.selectedRange];
}

- (IBAction)outlineBodySelection {
    [self.body.textStorage addAttributes:@{NSStrokeWidthAttributeName:@-3,
                                           NSStrokeColorAttributeName:[UIColor blackColor]}
                                   range:self.body.selectedRange];
}

- (IBAction)unoutlineBodySelection {
    [self.body.textStorage removeAttribute:NSStrokeWidthAttributeName
                                     range:self.body.selectedRange];
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end