UITextField *tf = [alertView textFieldAtIndex:0];//獲得輸入框

if(self.selectArray.count < 6)

{

NSString *temp = [tf.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

//看剩下的字符串的長(zhǎng)度是否為零

if ([temp length]== 0) {

[UIAlertView alertViewWithTitle:@"請(qǐng)輸入標(biāo)簽" message:@"" cancelButtonTitle:@"確定" otherButtonTitles:nil onDismiss:^(NSInteger buttonIndex) {

} onCancel:^{

}];

return;

}