IOS7筆記-5、視圖控制器生命週期

標籤：

1、字型屬性的添加方法

 1 - (IBAction)changeBodySelectedColorMatchBackgroundOfButton:(UIButton *)sender { 2     [self.body.textStorage addAttribute:NSForegroundColorAttributeName 3                                   value:sender.backgroundColor 4                                   range:self.body.selectedRange]; 5 } 6  7 - (IBAction)outlineBodySelection { 8     [self.body.textStorage addAttributes:@{NSStrokeWidthAttributeName: @-3, 9                                            NSStrokeColorAttributeName: [UIColor blackColor]} range:self.body.selectedRange];10 }11 - (IBAction)unOutlineBodySelection {12     [self.body.textStorage removeAttribute:NSStrokeWidthAttributeName13                                      range:self.body.selectedRange];14 }

2、按鈕字型描邊設定，一般在viewDidLoad中實現

 1 - (void)viewDidLoad 2 { 3     [super viewDidLoad]; 4     // Do any additional setup after loading the view, typically from a nib. 5     NSMutableAttributedString *title = 6     [[NSMutableAttributedString alloc] initWithString:self.outlineButton.currentTitle]; 7     [title setAttributes:@{NSStrokeWidthAttributeName: @3, 8                            NSStrokeColorAttributeName: self.outlineButton.tintColor} 9                    range:NSMakeRange(0, [title length])];10     [self.outlineButton setAttributedTitle:title forState:UIControlStateNormal];11 }

3、使用使用者佈建的字型

1 -(void)usePerferredFont2 {3     self.body.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];4     self.headline.font = [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline];5 }

4、添加廣播與去除廣播一般分別在viewWillAppear和viewWillDisappear中設定

 1 -(void)viewWillAppear:(BOOL)animated 2 { 3     [super viewWillAppear:animated]; 4     [self usePerferredFont]; 5     [[NSNotificationCenter defaultCenter] addObserver:self 6                                              selector:@selector(perferredFontChanged:) 7                                                  name:UIContentSizeCategoryDidChangeNotification object:nil]; 8 } 9 10 -(void)viewWillDisappear:(BOOL)animated11 {12     [super viewWillDisappear:animated];13     [[NSNotificationCenter defaultCenter] removeObserver:self14                                                     name:UIContentSizeCategoryDidChangeNotification15                                                   object:nil];16 }17 18 -(void)perferredFontChanged:(NSNotification *)notification19 {20     [self usePerferredFont];21 }22 23 -(void)usePerferredFont24 {25     self.body.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];26     self.headline.font = [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline];27 }

5、viewDidLoad中設定初始化執行個體相關，viewWillAppear則表示與介面相關已經初始化完畢，若有需要耗時資源則亦放置在viewWillAppear中實現！

IOS7筆記-5、視圖控制器生命週期