IOS中十六进制的颜色转换为UIColor

方法一：UIColor* rgb(NSString* color, float alpha){color = [color lowercaseString]; float rFloat = 0, gFloat = 0, bFloat = 0; for (int i=0; i<6; i++) { NSString *singleValue = [color substringWithRange:NSMakeRange(i, 1)]; singleValue = [singleValue stringByReplacingOccurrencesOfString:@"a" withString:@"10"]; singleValue = [singleValue stringByReplacingOccurrencesOfString:@"b" withString:@"11"]; singleValue = [singleValue stringByReplacingOccurrencesOfString:@"c" withString:@"12"]; singleValue = [singleValue stringByReplacingOccurrencesOfString:@"d" withString:@"13"]; singleValue = [singleValue stringByReplacingOccurrencesOfString:@"e" withString:@"14"]; singleValue = [singleValue stringByReplacingOccurrencesOfString:@"f" withString:@"15"]; // NSLog(@"singleValue[%i] = %@", i, singleValue); switch (i) { case 0: rFloat += [singleValue intValue] * 16; break; case 1: rFloat += [singleValue intValue]; break; case 2: gFloat += [singleValue intValue] * 16; break; case 3: gFloat += [singleValue intValue]; break; case 4: bFloat += [singleValue intValue] * 16; break; case 5: bFloat += [singleValue intValue]; break; default: break; } } // NSLog(@"rgb = R[%f] G[%f] B[%f]", rFloat, gFloat, bFloat); return [UIColor colorWithRed:rFloat/255.0 green:gFloat/255.0 blue:bFloat/255.0 alpha:alpha];}

方法二：#pragma mark - 颜色转换 IOS中十六进制的颜色转换为UIColor + (UIColor *) colorWithHexString: (NSString *)color { NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString]; // String should be 6 or 8 characters if ([cString length] < 6) { return [UIColor clearColor]; } // strip 0X if it appears if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2]; if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:1]; if ([cString length] != 6) return [UIColor clearColor]; // Separate into r, g, b substrings NSRange range; range.location = 0; range.length = 2; //r NSString *rString = [cString substringWithRange:range]; //g range.location = 2; NSString *gString = [cString substringWithRange:range]; //b range.location = 4; NSString *bString = [cString substringWithRange:range]; // Scan values 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]; }