【iOS】颜色类别hex十六进制格式

#import <UIKit/UIKit.h>

// 扩展UIColor类
@interface UIColor(Extend)

// 将十六进制的颜色值转为objective-c的颜色
+ (id)getColor:(NSString *) hexColor;

+ (id)getColor:(NSString *) hexColor alpha:(CGFloat)alpha;

@end

@implementation UIColor(Extend)

+ (id)getColor:(NSString *) hexColor alpha:(CGFloat)alpha
{
    unsigned int redInt_, greenInt_, blueInt_;
    NSRange rangeNSRange_;
    rangeNSRange_.length = 2;  // 范围长度为2
    
    // 取红色的值
    rangeNSRange_.location = 0; 
    [[NSScanner scannerWithString:[hexColor substringWithRange:rangeNSRange_]] scanHexInt:&redInt_];

    // 取绿色的值
    rangeNSRange_.location = 2; 
    [[NSScanner scannerWithString:[hexColor substringWithRange:rangeNSRange_]] scanHexInt:&greenInt_];
    
    // 取蓝色的值
    rangeNSRange_.location = 4; 
    [[NSScanner scannerWithString:[hexColor substringWithRange:rangeNSRange_]] scanHexInt:&blueInt_];   
    
    return [UIColor colorWithRed:(float)(redInt_/255.0f) green:(float)(greenInt_/255.0f) blue:(float)(blueInt_/255.0f) alpha:alpha];
}

+ (id)getColor:(NSString *) hexColor
{
    return [self getColor:hexColor alpha:1.0f];
}

@end