Question

我需要使用：

[[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed:102/256.0 green:53/256.0 blue:0/256.0 alpha:1.0]];

在我的appDelegate.m中，但是我需要将UIColor设置为hex＃“669900” 我怎样才能以简单的方式实现这一目标？

Answer 1

将类别添加到UIColor - UIColor（HexAdditions）

在UIColor + HexAdditions.h

中

#import <UIKit/UIKit.h>

@interface UIColor (HexAdditions)
+ (UIColor*)colorWithHexString:(NSString*)hexString;
+ (UIColor*)colorWithHexString:(NSString*)hexString alpha:(CGFloat)alpha;

@end

在UIColor + HexAdditions.m

中

#import "UIColor+HexAdditions.h"

@implementation UIColor (HexAdditions)

+ (UIColor*)colorWithHexString:(NSString*)hexString{
    hexString = [[hexString lowercaseString] stringByReplacingOccurrencesOfString:@"#" withString:@""];
    switch (hexString.length) {
        case 6:
            hexString = [hexString stringByAppendingString:@"ff"];
            break;
        case 8:
            //correct length
            break;
        default:
            return nil;
            break;
    }
    uint32_t rgba;
    NSScanner *scanner = [NSScanner scannerWithString:hexString];
    [scanner scanHexInt:&rgba];
    return [self colorWithHexValue:rgba];
}

+ (UIColor*)colorWithHexString:(NSString*)hexString alpha:(CGFloat)alpha{
    int alpha_ = alpha * 255;
    hexString = [hexString stringByAppendingFormat:@"%02x",alpha_];
    return [self colorWithHexString:hexString];
}

+ (UIColor*)colorWithHexValue:(uint32_t)rgba{
    CGFloat red = ((rgba & 0xFF000000) >> 24) / 255.0f;
    CGFloat green = ((rgba & 0x00FF0000) >> 16) / 255.0f;
    CGFloat blue = ((rgba & 0x0000FF00) >> 8) / 255.0f;
    CGFloat alpha = (rgba & 0x000000FF) / 255.0f;
    return [self colorWithRed:red green:green blue:blue alpha:alpha];
}

您可以将其用作

[UIColor colorWithHexString:@"#669900"];

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1 个答案: