創(chuàng)建一個(gè)分類Category： 支持十六進(jìn)制Hex顏色設(shè)置娃磺。
新建 -> Objective-c File 選擇 Category
只需輸入為分類起的名字Hex蝉绷，會自動生成分類名字的格式 UIColor+Hex
//.h文件
#define RGBA_COLOR(R, G, B, A) [UIColor colorWithRed:((R) / 255.0f) green:((G) / 255.0f) blue:((B) / 255.0f) alpha:A]
#define RGB_COLOR(R, G, B) [UIColor colorWithRed:((R) / 255.0f) green:((G) / 255.0f) blue:((B) / 255.0f) alpha:1.0f]
+ (UIColor *)colorWithHexString:(NSString *)color;
//從十六進(jìn)制字符串獲取顏色亡哄，
//color:支持@“#123456”枝缔、 @“0X123456”、 @“123456”三種格式
+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha;
+ (UIColor *)colorFromHexRGB:(NSString *)inColorString;
+ (UIImage *)imageWithColor:(UIColor *)color ;
//.m 文件
+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha
{
//刪除字符串中的空格
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
//如果是0x開頭的蚊惯，那么截取字符串愿卸，字符串從索引為2的位置開始，一直到末尾
if ([cString hasPrefix:@"0X"]){
cString = [cString substringFromIndex:2];
}
//如果是#開頭的截型，那么截取字符串趴荸，字符串從索引為1的位置開始，一直到末尾
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:alpha];
}
//默認(rèn)alpha值為1
+ (UIColor *)colorWithHexString:(NSString *)color
{
return [self colorWithHexString:color alpha:1.0f];
}
/*!
* method 通過16進(jìn)制計(jì)算顏色
* abstract
* discussion
* param 16機(jī)制
* result 顏色對象
*/
+ (UIColor *)colorFromHexRGB:(NSString *)inColorString
{
UIColor *result = nil;
unsigned int colorCode = 0;
unsigned char redByte, greenByte, blueByte;
if (nil != inColorString)
{
NSScanner *scanner = [NSScanner scannerWithString:inColorString];
(void) [scanner scanHexInt:&colorCode]; // ignore error
}
redByte = (unsigned char) (colorCode >> 16);
greenByte = (unsigned char) (colorCode >> 8);
blueByte = (unsigned char) (colorCode); // masks off high bits
result = [UIColor
colorWithRed: (float)redByte / 0xff
green: (float)greenByte/ 0xff
blue: (float)blueByte / 0xff
alpha:1.0];
return result;
}
//UIColor轉(zhuǎn)換成一張UIImage
+ (UIImage *)imageWithColor:(UIColor *)color {
CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f); //寬高 1.0只要有值就夠了
UIGraphicsBeginImageContext(rect.size); //在這個(gè)范圍內(nèi)開啟一段上下文
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);//在這段上下文中獲取到顏色UIColor
CGContextFillRect(context, rect);//用這個(gè)顏色填充這個(gè)上下文
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();//從這段上下文中獲取Image屬性,,,結(jié)束
UIGraphicsEndImageContext();
return image;
}
如何使用：
//直接在其他文件中：
UIColor *myColor = [UIColor 方法名];
