UIColor转十六进制字符串 方法一:经过测试发现部分颜色会转化为#fffff(五个f),转化残缺导致最后颜色无法还原,不推荐使用。 // UIColor转#ffffff格式的字符串 + (NSString *)hexFromUIColor:(UIColor *)color { if (CGColorGetNumberOfComponents(color.CGColor) < 4) { const CGFloat *components = CGColorGetComponents(color.CGColor); color = [UIColor colorWithRed:components[0] green:components[0] blue:components[0] alpha:components[1]]; } if (CGColorSpaceGetModel(CGColorGetColorSpace(color.CGColor)) != kCGColorSpaceModelRGB) { return [NSString stringWithFormat:@"#FFFFFF"]; } return [NSString stringWithFormat:@"#%x%x%x", (int)((CGColorGetComponents(color.CGColor))[0]*255.0), (int)((CGColorGetComponents(color.CGColor))[1]*255.0), (int)((CGColorGetComponents(color.CGColor))[2]*255.0)]; } 方法二:完美转化为#ffffff格式,暂未发现问题,推荐使用。 // UIColor转#ffffff格式的字符串 + (NSString *)hexStringFromColor:(UIColor *)color { const CGFloat *components = CGColorGetComponents(color.CGColor); CGFloat r = components[0]; CGFloat g = components[1]; CGFloat b = components[2]; return [NSString stringWithFormat:@"#%02lX%02lX%02lX", lroundf(r * 255), lroundf(g * 255), lroundf(b * 255)]; } 十六进制字符串转UIColor 方法一: + (CGFloat) colorComponentFrom: (NSString *) string start: (NSUInteger) start length: (NSUInteger) length { NSString *substring = [string substringWithRange: NSMakeRange(start, length)]; NSString *fullHex = length == 2 ? substring : [NSString stringWithFormat: @"%@%@", substring, substring]; unsigned hexComponent; [[NSScanner scannerWithString: fullHex] scanHexInt: &hexComponent]; return hexComponent / 255.0; } + (UIColor *) colorWithHexString: (NSString *) hexString { NSString *colorString = [[hexString stringByReplacingOccurrencesOfString: @"#" withString: @""] uppercaseString]; CGFloat alpha, red, blue, green; switch ([colorString length]) { case 3: // #RGB alpha = 1.0f; red = [self colorComponentFrom: colorString start: 0 length: 1]; green = [self colorComponentFrom: colorString start: 1 length: 1]; blue = [self colorComponentFrom: colorString start: 2 length: 1]; break; case 4: // #ARGB alpha = [self colorComponentFrom: colorString start: 0 length: 1]; red = [self colorComponentFrom: colorString start: 1 length: 1]; green = [self colorComponentFrom: colorString start: 2 length: 1]; blue = [self colorComponentFrom: colorString start: 3 length: 1]; break; case 6: // #RRGGBB alpha = 1.0f; red = [self colorComponentFrom: colorString start: 0 length: 2]; green = [self colorComponentFrom: colorString start: 2 length: 2]; blue = [self colorComponentFrom: colorString start: 4 length: 2]; break; case 8: // #AARRGGBB alpha = [self colorComponentFrom: colorString start: 0 length: 2]; red = [self colorComponentFrom: colorString start: 2 length: 2]; green = [self colorComponentFrom: colorString start: 4 length: 2]; blue = [self colorComponentFrom: colorString start: 6 length: 2]; break; default: return nil; } return [UIColor colorWithRed: red green: green blue: blue alpha: alpha]; } 方法二: + (UIColor *)colorWithHexString:(NSString *)hexString alpha:(CGFloat)alphaValue { NSString *cString = [[hexString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString]; if (cString.length < 6) return [UIColor clearColor]; if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2]; if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:1]; if (cString.length != 6) return [UIColor clearColor]; 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]; // 注意:myColor是自定义宏 //#define myColor(R, G, B, A) [UIColor colorWithRed:R/255.0 green:G/255.0 blue:B/255.0 alpha:A] return myColor(r, g, b, alphaValue); }