IOS中十六进制的颜色转换为UIColor

最新推荐文章于 2022-10-07 15:15:26 发布

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最新推荐文章于 2022-10-07 15:15:26 发布

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原文链接：http://www.cnblogs.com/jgCho/p/5434733.html

本文介绍了一种将十六进制颜色代码转换为iOS中UIColor对象的方法。通过解析十六进制字符串并将其转换为对应的红绿蓝三文数值，进而创建UIColor对象。此外，还提供了一个UIColor的类别扩展，用于更方便地从长整型十六进制颜色值创建UIColor。

IOS中十六进制的颜色转换为UIColor

#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];
}

【OBJC类扩展之Hex值颜色转换】UIColor+Hex
#import <UIKit/UIKit.h>

@interface UIColor (Hex)

+ (UIColor *)colorWithHex:(long)hexColor;
+ (UIColor *)colorWithHex:(long)hexColor alpha:(float)opacity;

@end


#import "UIColor+Hex.h"

@implementation UIColor (Hex)

+ (UIColor*) colorWithHex:(long)hexColor;
{
    return [UIColor colorWithHex:hexColor alpha:1.];    
}

+ (UIColor *)colorWithHex:(long)hexColor alpha:(float)opacity
{
    float red = ((float)((hexColor & 0xFF0000) >> 16))/255.0;
    float green = ((float)((hexColor & 0xFF00) >> 8))/255.0;
    float blue = ((float)(hexColor & 0xFF))/255.0;
    return [UIColor colorWithRed:red green:green blue:blue alpha:opacity];  
}   

@end

转载于:https://www.cnblogs.com/jgCho/p/5434733.html