项目中经常会用到颜色转换，有的是通过十六进制转成数字转颜色，想简单的点直接通过字符串转一下，简单扩展了一下分类UIColor，代码如下:
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+(UIColor *)colorWithHex:(
NSString
*)hexColor{
return
[
self
colorWithHex:hexColor alpha:1.0f];
}
//http://www.cnblogs.com/xiaofeixiang iOS技术交流:228407086
+(UIColor *)colorWithHex:(
NSString
*)hexColor alpha:(
float
)alpha{
//删除空格
NSString
*colorStr = [[hexColor stringByTrimmingCharactersInSet:[
NSCharacterSet
whitespaceAndNewlineCharacterSet]] uppercaseString];
// String should be 6 or 8 characters
if
([colorStr length] < 6||[colorStr length]>7)
{
return
[UIColor clearColor];
}
//
if
([colorStr hasPrefix:@
"#"
])
{
colorStr = [colorStr substringFromIndex:1];
}
NSRange
range;
range.location = 0;
range.length = 2;
//red
NSString
*redString = [colorStr substringWithRange:range];
//green
range.location = 2;
NSString
*greenString = [colorStr substringWithRange:range];
//blue
range.location = 4;
NSString
*blueString= [colorStr substringWithRange:range];
// Scan values
unsigned
int
red, green, blue;
[[
NSScanner
scannerWithString:redString] scanHexInt:&red];
[[
NSScanner
scannerWithString:greenString] scanHexInt:&green];
[[
NSScanner
scannerWithString:blueString] scanHexInt:&blue];
return
[UIColor colorWithRed:((
float
)red/ 255.0f) green:((
float
)green/ 255.0f) blue:((
float
)blue/ 255.0f) alpha:alpha];
}
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