#pragma mark判断字符串是否为空
+(BOOL) isBlankString:(NSString*)string {
NSString*astring = string;
astring = [astringstringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceCharacterSet]];
if(astring ==nil|| astring ==NULL) {
returnYES;
}
if([astringisEqualToString:@"\n"]) {
returnYES;
}
if([astringisKindOfClass:[NSNullclass]]) {
returnYES;
}
if([[astringstringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceCharacterSet]]length]==0) {
returnYES;
}
returnNO;
}
