IOS7笔记-６、控制器多态性、导航控制器、选项卡栏控制器

１、遍历符合条件字符

1 -(NSAttributedString *)charactersWithAttribute:(NSString *)attributeName 2 { 3 NSMutableAttributedString *characters = [[NSMutableAttributedString alloc] init]; 4 5 int index = 0; 6 while (index < [self.textToAnalyze length]) { 7 NSRange range; 8 id value = [self.textToAnalyze attribute:attributeName 9 atIndex:index 10 effectiveRange:&range]; 11 if (value) { 12 [characters appendAttributedString:[self.textToAnalyze attributedSubstringFromRange:range]]; 13 index = range.location + range.length; 14 } else { 15 index++; 16 } 17 } 18 19 return characters; 20 } 1 -(void)updateUI 2 { 3 self.colorfulCharactersLabel.text = [NSString stringWithFormat:@"%d colorful characters", [[self charactersWithAttribute:NSForegroundColorAttributeName] length]]; 4 self.outlinedCharactersLabel.text = [NSString stringWithFormat:@"%d outlined characters", [[self charactersWithAttribute:NSStrokeWidthAttributeName] length]]; 5 }

２、segue识别代码

1 -(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 2 { 3 if ([segue.identifier isEqualToString:@"Analyze Text"]) { 4 if ([segue.destinationViewController isKindOfClass:[TextStatsViewController class]]) { 5 TextStatsViewController *tsvc = (TextStatsViewController *)segue.destinationViewController; 6 tsvc.textToAnalyze = self.body.textStorage; 7 } 8 } 9 }

 

转载于:https://www.cnblogs.com/jonathan236/p/5562663.html

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