字符串区分颜色和大小

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iOS利用NSAttributeString实现不同颜色大小显示的方法

一个UILabel显示不同大小颜色的字符串,当然我们首先的想到属性字符串,但是注意：我们这里要处理国际化完成的字符串

比如：2分14秒 或者 2min 14secs

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UILabel *label;
@end
@implementation ViewController
- (void)viewDidLoad {
 [super viewDidLoad];
 
 //调用
 NSAttributedString *resultTime = [self formattedCurrentTime:133];
 self.label.attributedText = resultTime;
}

一、字符串range匹配法

/**
 返回当前时间格式
 @return 返回组装好的字符串
 */
- (NSAttributedString *)formattedCurrentTime:(NSTimeInterval)timeInterval {
 
 NSUInteger time = (NSUInteger)timeInterval;
 NSInteger minutes = (time / 60) % 60;
 NSInteger seconds = time % 60;
 NSString *minStr = [NSString stringWithFormat:@" %zd ",minutes];
 NSString *secStr = [NSString stringWithFormat:@" %zd ",seconds];
 //假设这就是我们国际化后的字符串
 NSString *localizedFormatString = [NSString stringWithFormat:@"%@分%@秒",minStr,secStr];
 NSMutableAttributedString *attributeStr = [[NSMutableAttributedString alloc] initWithString:localizedFormatString];
 NSRange minRange, secRange;
 if (@available(iOS 9.0, *)) {
 minRange = [localizedFormatString localizedStandardRangeOfString:minStr];
 secRange = [localizedFormatString localizedStandardRangeOfString:secStr];
 } else {
 minRange = [localizedFormatString rangeOfString:minStr];
 secRange = [localizedFormatString rangeOfString:secStr];
 }
 NSDictionary *timeAttrs = @{ NSForegroundColorAttributeName : [UIColor redColor],
     NSFontAttributeName : [UIFont systemFontOfSize:40.0f]};
 [attributeStr addAttributes:timeAttrs range:minRange];
 [attributeStr addAttributes:timeAttrs range:secRange]; 
 return [[NSAttributedString alloc] initWithAttributedString:attributeStr];;
}

二、用正则匹配数字

/**
 返回当前时间格式
 @return 返回组装好的字符串
 */
- (NSAttributedString *)formattedCurrentTime:(NSTimeInterval)timeInterval {
 
 NSUInteger time = (NSUInteger)timeInterval;
 NSInteger minutes = (time / 60) % 60;
 NSInteger seconds = time % 60;
 NSString *minStr = [NSString stringWithFormat:@" %zd ",minutes];
 NSString *secStr = [NSString stringWithFormat:@" %zd ",seconds];
 //假设这就是我们国际化后的字符串
 NSString *localizedFormatString = [NSString stringWithFormat:@"%@分%@秒",minStr,secStr];
 NSMutableAttributedString *attributeStr = [[NSMutableAttributedString alloc] initWithString:localizedFormatString];
 NSDictionary *timeAttrs = @{ NSForegroundColorAttributeName : [UIColor redColor],
     NSFontAttributeName : [UIFont systemFontOfSize:40.0f]}; 
 /** 方案2 **/
 NSError *error = nil;
 NSRegularExpression *reg = [NSRegularExpression regularExpressionWithPattern:@"[0-9]+" options:NSRegularExpressionCaseInsensitive error:&error];
 if (error == nil) {
 NSArray *matches = [reg matchesInString:localizedFormatString options:NSMatchingReportCompletion range:NSMakeRange(0, localizedFormatString.length)];
 for (NSTextCheckingResult *match in matches) {
  for (NSUInteger i = 0; i < match.numberOfRanges; i++) {
  NSRange range = [match rangeAtIndex:i];
  if (range.location != NSNotFound) {
     [attributeStr addAttributes:timeAttrs range:range];
     }
   }
  }
 }
 return [[NSAttributedString alloc] initWithAttributedString:attributeStr];;
}

时间格式化代码如下：

/**
 返回时间格式 HH:mm:ss
 @return 返回组装好的字符串
 */
- (NSString *)formattedCurrentTime {
 NSUInteger time = (NSUInteger)self.recorder.currentTime;
 NSInteger hours = (time / 3600);
 NSInteger minutes = (time / 60) % 60;
 NSInteger seconds = time % 60;
 
 NSString *format = @"%02i:%02i:%02i";
 return [NSString stringWithFormat:format, hours, minutes, seconds];
}