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Possible Duplicate:
performSelector may cause a leak because its selector is unknown
我在非 ARC 中有这段代码可以正常工作，没有错误或警告:
- (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
}
}
但是，在我将项目转换为 ARC 后，我收到此警告:
“执行选择器可能会导致泄漏，因为它的选择器是未知的。”
我会很感激关于如何相应地修改我的代码的想法..