//判断是否全是空格
+ (BOOL)isKGEmpty:(NSString *) str {
if (!str) {
return true;
} else {
NSCharacterSet *set = [NSCharacterSet whitespaceAndNewlineCharacterSet];
NSString *trimedString = [str stringByTrimmingCharactersInSet:set];
if ([trimedString length] == 0) {
return true;
} else {
return false;
}
}
}
