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Possible Duplicate: performSelector may cause a leak because its selector is unknown I have this code in non-ARC that works without errors or warnings: - (void)addTarget:(id)target action:(SEL)action forControlEvents:(UIControlEvents)controlEvents { // Only care about value changed controlEvent _target = target; _action = action; } - (void)setValue:(float)value { if (value > _maximumValue) { value = _maximumValue; } else if (value < _minimumValue){ value = _minimumValue; } // Check range if (value <= _maximumValue & value >= _minimumValue) { _value = value; // Rotate knob to proper angle rotation = [self calculateAngleForValue:_value]; // Rotate image thumbImageView.transform = CGAffineTransformMakeRotation(rotation); } if (continuous) { [_target performSelector:_action withObject:self]; //warning here } } However, after I convert to project to ARC, I get this warning: "Perform Selector may cause a leak because its selector is unknown." I would appreciate ideas on how to revise my code accordingly..

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