iOS 十六進制的顏色值轉換爲UIColor

UIColor+Hex.h裏面中

#import <UIKit/UIKit.h>

@interface UIColor (Hex)
+ (UIColor *) colorWithHexString: (NSString *)color;
@end

 

UIColor+Hex.m裏面中

#import "UIColor+Hex.h"

@implementation UIColor (Hex)

#pragma mark - 顏色轉換 iOS中十六進制的顏色轉換爲UIColor

+ (UIColor *) colorWithHexString: (NSString *)hexString
{
    NSString *cString = [[hexString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
    
    //hexString應該6到8個字符
    if ([cString length] < 6) {
        return [UIColor clearColor];
    }
    
    //若是hexString 有@"0X"前綴
    if ([cString hasPrefix:@"0X"])
        cString = [cString substringFromIndex:2];
    
    //若是hexString 有@"#""前綴
    if ([cString hasPrefix:@"#"])
        cString = [cString substringFromIndex:1];
    if ([cString length] != 6)
        return [UIColor clearColor];
    
    //RGB轉換
    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];
    
    //
    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

使用方法：

//一、添加頭文件
#import "UIColor+Hex.h"

//二、在須要的地方 [UIColor colorWithHexString:@"十六進制"]
//eg:
[self.view setBackgroundColor:[UIColor colorWithHexString:@"#11489B"]];