To file for divorce in Iowa you must meet the residency requirement of having lived in the state for one (1) year prior to filing. The plaintiff does not have to meet the residency requirement as long as the respondent has lived in the state for the previous year.
A decree dissolving the marriage may be entered when the court is satisfied from the evidence presented that there has been a breakdown of the marriage relationship to the extent that the legitimate objects of matrimony have been destroyed and there remains no reasonable likelihood that the marriage can be preserved.
The court shall divide all property, except inherited property or gifts received by one party, equitably between the parties after considering all of the following:
Spousal support is decided upon a case-by-case basis and can be ordered to either party for a limited or indefinite length of time after considering all of the following:
The court, insofar as it is reasonable and in the best interest of the child, shall order the child custodyaward, including liberal visitation rights where appropriate, which will assure the child the opportunity for the maximum continuing physical and emotional contact with both parents after the parents have separated or dissolved the marriage, and which will encourage parents to share the rights and responsibilities of raising the child unless direct physical harm or significant emotional harm to the child, other children, or a parent is likely to result from such contact with one parent.
In considering what custody arrangement is in the best interest of the minor child, the court shall consider the following factors:
The court may order either parent or both parents to pay an amount reasonable and necessary for supporting a child. In establishing the amount of support, consideration shall be given to the responsibility of both parents to support and provide for the welfare of the minor child and of a child's need for a close relationship with both parents. Iowa maintains uniform child support guidelines and criteria in determining the child support obligation.
https://www.legis.iowa.gov (Iowa divorce code)