They are a huge pain in the ass. Most of the US where they are a problem we grab our dogs, trap, bait, a rifle or shotgun plus a pistol as backup and blast em.
I had built a hog trap several years ago and have managed to catch a few until... The dumbest deer in the woods comes along and ...Bam hung up in the trap Silly thing couldn't find the hole cut in the top too jump out off. Off I go at 6am to release the animal. I have the trap here at the house, when I get the time back in the woods it will go!
Several years ago I got home to find a wild boar (not a farmyard porker) rooting under my Scuppernong grapevines. He was eating the fallen grapes. I rushed at him with my car and chased him off. The National Forrest was a few miles away, and he somehow got inside my fence. Never saw him again fortunately. Everytime I went outside for some time I carried my pistol.