iOS 判断页面中的该填项是否填完整,改变按钮状态的方法

//判断是否有值,只要有NO，就为灰色，如果都为yes，那就直到最后一个都为yes时，即为yes
+ (void)setButtonStatusBytextFeilds:(NSArray *)textFeildArr button:(UIButton *)button{
 for (UITextField *textF in textFeildArr) {
 if (textF.text.length <= 0) {
  [button setBackgroundColor:kLineColor];
  button.enabled = NO;
  return;
 }else{
  if ([(UITextField *)textFeildArr[textFeildArr.count - 1] text] > 0) {
  [button setBackgroundColor:kGreenColor];
  button.enabled = YES;
  }
 }
 }
}

//给每个textFeild 添加监听
self.textFArr = @[_passordF,_surePasswordF];
 for (UITextField *textF in _textFArr) {
  [textF addTarget:self action:@selector(setBtnStatus) forControlEvents:(UIControlEventEditingChanged)];
 }

//调取判断方法
- (void)setBtnStatus{
 [ShowTool setButtonStatusBytextFeilds:_textFArr button:_registerBtn];
}