//
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// UIColor+Random.m
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// iOS-Categories (https://github.com/shaojiankui/iOS-Categories)
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//
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// Created by Jakey on 14/12/15.
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// Copyright (c) 2014年 www.skyfox.org. All rights reserved.
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//
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#import "UIColor+Random.h"
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@implementation UIColor (Random)
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+ (UIColor *)RandomColor {
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NSInteger aRedValue = arc4random() % 255;
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NSInteger aGreenValue = arc4random() % 255;
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NSInteger aBlueValue = arc4random() % 255;
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UIColor *randColor = [UIColor colorWithRed:aRedValue / 255.0f green:aGreenValue / 255.0f blue:aBlueValue / 255.0f alpha:1.0f];
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return randColor;
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}
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@end
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@implementation UIColor (EXtension_LMJ)
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+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha
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{
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//删除字符串中的空格
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NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
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// String should be 6 or 8 characters
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if ([cString length] < 6)
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{
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return [UIColor clearColor];
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}
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// strip 0X if it appears
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//如果是0x开头的，那么截取字符串，字符串从索引为2的位置开始，一直到末尾
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if ([cString hasPrefix:@"0X"])
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{
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cString = [cString substringFromIndex:2];
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}
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//如果是#开头的，那么截取字符串，字符串从索引为1的位置开始，一直到末尾
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if ([cString hasPrefix:@"#"])
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{
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cString = [cString substringFromIndex:1];
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}
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if ([cString length] != 6)
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{
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return [UIColor clearColor];
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}
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// Separate into r, g, b substrings
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NSRange range;
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range.location = 0;
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range.length = 2;
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//r
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NSString *rString = [cString substringWithRange:range];
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//g
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range.location = 2;
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NSString *gString = [cString substringWithRange:range];
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//b
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range.location = 4;
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NSString *bString = [cString substringWithRange:range];
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// Scan values
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unsigned int r, g, b;
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[[NSScanner scannerWithString:rString] scanHexInt:&r];
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[[NSScanner scannerWithString:gString] scanHexInt:&g];
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[[NSScanner scannerWithString:bString] scanHexInt:&b];
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return [UIColor colorWithRed:((float)r / 255.0f) green:((float)g / 255.0f) blue:((float)b / 255.0f) alpha:alpha];
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}
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//默认alpha值为1
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+ (UIColor *)colorWithHexString:(NSString *)color
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{
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return [self colorWithHexString:color alpha:1.0f];
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}
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@end
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