9.5 AutoLayout约束的优先级
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIView *purpleView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
//点击空白 让紫色view消失
[self.purpleView removeFromSuperview];
[UIView animateWithDuration:2.0 animations:^{
[self.view layoutIfNeeded];
}];
}
@end
