Sorcerous Knight

I've pretty much put Eldritch Knight in word-for-word, but replaced anything Wizard with Sorcerer, and made it Charisma based rather than Intelligence based.

 

Changelog:

V1.1 fixes an issue where user could gain a free spell of 5th level or lower upon gaining subclass, and the order of the abilities as they show up in the class features list.

V1.2 fixed the bonus action attacks names granted by the War Magic and Improved War Magic features, as well as fixing the Improved War Magic's attack bonus.

Spellcasting

When you reach 3rd level, you augment your martial prowess with the ability to cast spells. See chapter 10 of the PHB for the general rules of spellcasting and chapter 11 of the PHB for the sorcerer spell list.

Cantrips:

You learn two cantrips of your choice from the sorcerer spell list. You learn an additional sorcerer cantrip of your choice at 10th level.

Spell slot:

The Sorcerous Knight Spellcasting table shows how many spell slots you have to cast your spells of 1st level and higher. To cast one of these spells, you must expend a slot of the spell's level or higher. You regain all expended spell slots when you finish a long rest.
For example, if you know the 1st-level spell shield and have a 1st-level and a 2nd-level spell slot available, you can cast shield using either slot.

Spells Known of 1st-Level and Higher:

You know three 1st-level sorcerer spells of your choice, two of which you must choose from the abjuration and evocation spells on the sorcerer spell list.
The Spells Known column of the Sorcerous Knight Spellcasting table shows when you learn more sorcerer spells of 1st-level or higher. Each of these spells must be an abjuration or evocation spell of your choice, and must be of a level for which you have spell slots. For instance, when you reach 7th level in this class, you can learn one new spell of 1st or 2nd level.
The spells you learn at 8th, 14th, and 20th level can come from any school of magic.
Whenever you gain a level in this class, you can replace one of the sorcerer spells you know with another spell of your choice from the sorcerer spell list. The new spell must be of a level for which you have spell slots, and it must be an abjuration or evocation spell, unless you're replacing the spell you gained at 8th, 14th, or 20th level.

Spellcasting Ability: 

Charisma is your spellcasting ability for your sorcerer spells, since you know your spells from some sorcerous bloodline. You use your Charisma whenever a spell refers to your spellcasting ability. In addition, you use your Charisma modifier when setting the saving throw DC for a sorcerer spell you cast and when making an attack roll with one.

Spell save DC = 8 + your proficiency bonus + your Charisma modifier
Spell attack modifier = your proficiency bonus + your Charisma modifier

Weapon Bond

At 3rd level, you learn a ritual that creates a magical bond between yourself and one weapon. You perform the ritual over the course of 1 hour, which can be done during a short rest. The weapon must be within your reach throughout the ritual, at the conclusion of which you touch the weapon and forge the bond.
Once you have bonded a weapon to yourself, you can't be disarmed of that weapon unless you are incapacitated. If it is on the same plane of existence, you can summon that weapon as a bonus action on your turn, causing it to teleport instantly to your hand.
You can have up to two bonded weapons, but can summon only one at a time with your bonus action. 
If you attempt to bond with a third weapon, you must break the bond with one of the other two.

War Magic

Beginning at 7th level, when you use your action to cast a cantrip, you can make one weapon attack as a bonus action.

Eldritch Strike

At 10th level, you learn how to make your weapon strikes undercut a creature's resistance to your spells. When you hit a creature with a weapon attack, that creature has disadvantage on the next saving throw it makes against a spell you cast before the end of your next turn. 

Arcane Charge

At 15th level, you gain the ability to teleport up to 30 feet to an unoccupied space you can see when you use your Action Surge. You can teleport before or after the additional action.

Improved War Magic

Starting at 18th level, when you use your action to cast a spell, you can make one weapon attack as a bonus action.