UIButton 不同状态图片来回切换

做百度地图是否显示路况信息，用到两种状态的图片

第一种方法：用Bool进行标记

声明一个 Bool _isRoad;

- (void)roadBtnAction:(UIButton *)sender

{

if (!_isRoad) {

[_roadBtn setBackgroundImage:[UIImage imageNamed:@"map_road_condition_sel"] forState:UIControlStateNormal];

[_mapView setTrafficEnabled:YES];

} else {

[_roadBtn setBackgroundImage:[UIImage imageNamed:@"map_road_condition_nor"] forState:UIControlStateNormal];

[_mapView setTrafficEnabled:NO];

}

_isRoad = !_isRoad;

}

第二种方法：用一个值进行标记

@property (nonatomic, assign) NSInteger count;

self.count = 0;

_count++;

if (_count % 2) {

[_roadBtn setBackgroundImage:[UIImage imageNamed:@"map_road_condition_sel"] forState:UIControlStateNormal];

[_mapView setTrafficEnabled:YES];

} else {

[_roadBtn setBackgroundImage:[UIImage imageNamed:@"map_road_condition_nor"] forState:UIControlStateNormal];

[_mapView setTrafficEnabled:NO];

}