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- (NSDictionary *)parse:(NSString *)string error:(NSError **)error
{
self.scanner = [NSScanner scannerWithString:string];
self.scanner.charactersToBeSkipped = [NSCharacterSet whitespaceCharacterSet];
NSMutableDictionary *result = [NSMutableDictionary dictionary];
NSCharacterSet *letters = [NSCharacterSet letterCharacterSet]
while (!self.scanner.isAtEnd) {
NSString *key = nil;
UIColor *value = nil;
BOOL didScan = [self.scanner scanCharactersFromSet:letters intoString:&key] &&
[self.scanner scanString:@"=" intoString:NULL] &&
[self scanColor:&value];
result[key] = value;
[self.scanner scanCharactersFromSet:[NSCharacterSet newlineCharacterSet]
intoString:NULL]; // 繼續(xù)掃描下一行
}
}
- (BOOL)scanColor:(UIColor **)out
{
return [self scanHexColorIntoColor:out] || [self scanTupleColorIntoColor:out];
}
//掃描設置#ff0000這樣的
- (BOOL)scanHexColorIntoColor:(UIColor **)out
{
NSCharacterSet *hexadecimalCharacterSet =
[NSCharacterSet characterSetWithCharactersInString:@"0123456789abcdefABCDEF"];
NSString *colorString = NULL;
if ([self.scanner scanString:@"#" intoString:NULL] &&
[self.scanner scanCharactersFromSet:hexadecimalCharacterSet
intoString:&colorString] &&
colorString.length == 6) {
*out = [UIColor colorWithHexString:colorString];
return YES;
}
return NO;
}
- (BOOL)scanTupleColorIntoColor:(UIColor **)out
{
NSInteger red, green, blue = 0;
BOOL didScan = [self.scanner scanString:@"(" intoString:NULL] &&
[self.scanner scanInteger:&red] &&
[self.scanner scanString:@"," intoString:NULL] &&
[self.scanner scanInteger:&green] &&
[self.scanner scanString:@"," intoString:NULL] &&
[self.scanner scanInteger:&blue] &&
[self.scanner scanString:@")" intoString:NULL];
if (didScan) {
*out = [UIColor colorWithRed:(CGFloat)red/255.
green:(CGFloat)green/255.
blue:(CGFloat)blue/255.
alpha:1];
return YES;
} else {
return NO;
}
}
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