1.button.allTargets
2.NSArray *actions = [button actionsForTarget:target forControlEvent:UIControlEventTouchUpInside];
3.[button addTarget:target action:NSSelectorFromString(action) forControlEvents:UIControlEventTouchUpInside];
1.button.allTargets
2.NSArray *actions = [button actionsForTarget:target forControlEvent:UIControlEventTouchUpInside];
3.[button addTarget:target action:NSSelectorFromString(action) forControlEvents:UIControlEventTouchUpInside];