iOS 十六进制的颜色值转换为UIColor

#import <UIKit/UIKit.h>

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

#import "UIColor+Hex.h"

@implementation UIColor (Hex)

#pragma mark - 颜色转换 iOS中十六进制的颜色转换为UIColor

+ (UIColor *) colorWithHexString: (NSString *)hexString
{
NSString *cString = [[hexString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

//hexString应该6到8个字符
if ([cString length] < 6) {
return [UIColor clearColor];
}

//如果hexString 有@"0X"前缀
if ([cString hasPrefix:@"0X"])
cString = [cString substringFromIndex:2];

//如果hexString 有@"#""前缀
if ([cString hasPrefix:@"#"])
cString = [cString substringFromIndex:1];
if ([cString length] != 6)
return [UIColor clearColor];

//RGB转换
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

//1、添加头文件
#import "UIColor+Hex.h"

//2、在需要的地方 [UIColor colorWithHexString:@"十六进制"]
//eg:
[self.view setBackgroundColor:[UIColor colorWithHexString:@"#11489B"]];