Question

如何在APP extension 中使用PureLayout

Answer 1

#import "PureLayout.h"
#import
........
.........
(instancetype)init
{
self = [super init];
NSLog(@"-----EmojiKeyboardView: init------");
// layout bottom group, align parent bottom, height 40;
self.bottomGroup = [[UIView alloc] init];
self.bottomGroup.translatesAutoresizingMaskIntoConstraints = NO;
self.bottomGroup.backgroundColor = [UIColor blueColor];
[self addSubview:self.bottomGroup];
}
....
....
(void) updateConstraints
{
if (!self.didSetupConstraints) {
[self.bottomGroup autoCenterInSuperview];

self.didSetupConstraints = YES;

}
[super updateConstraints];
}
keyboard extension crash and report:
'NSInvalidArgumentException', reason: '-[UIView autoCenterInSuperview]: unrecognized selector sent to instance 0x147e2dd10'