Use the class to extend a class method for the Uicolor class to implement a hexadecimal string into a Uicolor object

#import <UIKit/UIKit.h>

@interface Uicolor (Colorwithhexstrig)

+ (Uicolor *) colorwithhexstring: (NSString *) hexstring;

@end

#import "Uicolor+colorwithhexstrig.h"

@implementation Uicolor (Colorwithhexstrig)

Get uicolor based on hexadecimal values

+ (Uicolor *) colorwithhexstring: (NSString *) hexstring{

Remove the spaces at both ends of the string, and take lowercase conversions uppercase

NSString *colorstring = [[HexString stringbytrimmingcharactersinset:[nscharacterset Whitespaceandnewlinecharacterset]] uppercasestring];

When the given string length is less than 6 o'clock, returns the transparent

if (Colorstring.length < 6) {

return [Uicolor Clearcolor];

}

Strip 0X if it appears

if ([colorstring hasprefix:@ "0X"])

colorstring = [colorstring substringfromindex:2];

if ([colorstring hasprefix:@ "#"])

colorstring = [colorstring substringfromindex:1];

if ([colorstring length]! = 6)

return [Uicolor Clearcolor];

unsigned int red = 0,green = 0,blue = 0;

Nsrange range = Nsmakerange (0, 2);

[[Nsscanner scannerwithstring:[colorstring Substringwithrange:range]] scanhexint:&red];

Range.location = 2;

[[Nsscanner scannerwithstring:[colorstring Substringwithrange:range]] scanhexint:&green];

Range.location = 4;

[[Nsscanner scannerwithstring:[colorstring Substringwithrange:range]] scanhexint:&blue];

return [Uicolor colorwithred:red/255.0 green:green/255.0 blue:blue/255.0 alpha:1];

}

@end

Use the class to extend a class method for the Uicolor class to implement a hexadecimal string into a Uicolor object