十六进制颜色转换成UIColor

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原文出自

interface

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@interface UIColor (hex)
  + (UIColor *)colorWithHexString:(NSString *)stringToConvert;
@end

implementation

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#import <QuartzCore/QuartzCore.h>
#define DEFAULT_VOID_COLOR [UIColor whiteColor]
@implementation UIColor (hex)
+ (UIColor *)colorWithHexString:(NSString *)stringToConvert {
  NSString *cString = [[stringToConvert
      stringByTrimmingCharactersInSet:[NSCharacterSet
                                          whitespaceAndNewlineCharacterSet]]
      uppercaseString];
  if ([cString length] < 6)
    return DEFAULT_VOID_COLOR;
  if ([cString hasPrefix:@"#"])
    cString = [cString substringFromIndex:1];
  if ([cString length] != 6)
    return DEFAULT_VOID_COLOR;
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  NSRange range;
  range.location = 0;
  range.length = 2;
  NSString *rString = [cString substringWithRange:range];
  range.location = 2;
  NSString *gString = [cString substringWithRange:range];
  range.location = 4;
  NSString *bString = [cString substringWithRange:range];
  unsigned int r, g, b;
  [[NSScanner scannerWithString:rString] scanHexInt:&r];
  [[NSScanner scannerWithString:gString] scanHexInt:&g];
  [[NSScanner scannerWithString:bString] scanHexInt:&b];
  return [UIColor colorWithRed:((float)r / 255.0f)
                         green:((float)g / 255.0f)
                          blue:((float)b / 255.0f)
                         alpha:1.0f];
}
@end

使用

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[UIColor colorWithHexString:@"4fc2e9"]