1.防止子视图响应父视图的手势
<UIGestureRecognizerDelegate>
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
if (self.contentView) {
if ([touch.view isDescendantOfView:self.contentView]) {
return NO;
}
}
return YES;
}
2.animate动画
使用frame
[UIView animateWithDuration:0.1 animations:^{
view.frame = tempFrame;
} completion:^(BOOL finished) {
if (finished) {
otherView.hidden = YES;
}
}];
使用constraints
[self updateConstraintsIfNeeded];//必要
[UIView animateWithDuration:0.3 animations:^{
//update：改变已有的或者创建一个新的；remake：全部重写
[view mas_updateConstraints:^(MASConstraintMaker *make) {
make_left_equalTo(self.mas_left).offset(10);
}];
[self layoutIfNeeded];//必要
} completion:^(BOOL finished) {
}];
3.父视图改变frame导致子视图改变frame
解决：
superview.autoresizeSubviews = NO;
4.设置阴影
//设置背景色，否则该view本身不会有阴影（应该是因为默认透明），其所有的subviews会有阴影
_overviewView.layer.backgroundColor = [UIColor whiteColor].CGColor;
//设置阴影的颜色
_overviewView.layer.shadowColor = [UIColor blackColor].CGColor;
//设置偏移量，x轴、y轴，默认x=0，y=-3
_overviewView.layer.shadowOffset = CGSizeMake(0, 1);
//设置阴影的透明度
_overviewView.layer.shadowOpacity = 0.2;
//设置阴影大小
_overviewView.layer.shadowRadius = 3;
5.子视图超出父视图的显示范围
superView.clipsToBounds = YES;//子视图超出父视图范围部分不显示
