The phrase "affects an attitude" is correct and usable in written English.
You can use it when discussing how something influences or changes someone's mindset or perspective.
Example: "The constant negativity in the workplace affects an attitude of collaboration among team members."
Alternatives: "influences a mindset" or "shapes a perspective."
Shoulders hunched, chin thrust forward, gaunt frame poured into jet-colored jeans, he affected an attitude straight out of Poe.
Crystal masks her frustration and anger by affecting an attitude of tolerant superiority toward Jamie's impatience and air of entitlement.
The only defense was to become equally crass while affecting an attitude of indifference, and I did this so well that it is still difficult for me to have a conversation with a high school friend with my children in the room.
Below are a few examples of the word "affect" being used in this way: Richard affected an attitude of indifference, though he was deeply hurt by the comments.
Talitha, one of the princess's friends whose photos adorn the book, affects a blasé attitude toward beauty: "With a good man, a woman doesn't need treatments, health foods, vitamins, or anything... not at first".
The dancer, who affects a logo and attitude similar to those of the rock star Prince, made his first appearance onstage cross-dressed as a female flamenco dancer in a ruffled skirt with a 30-foot train.
Meryl Streep, the other eminence, who always affects a "who, me?" attitude at the Oscars, was too plain: her off-the-shoulder Lanvin top looked like it belonged on a couch, in a living room (which is perhaps where she would rather have been).
23 Several studies have shown that repeat biopsy leads to a detection rate for prostate cancer of 19-59%, 24 25 26 so understanding how a first biopsy affects a man's attitude to additional procedures if needed is essential.
Nemerov was himself clearly a depressive, but he never affected any attitude toward self-destruction.
