最近检查代码 发现了两个问题 记录一下~
解决CollectionView reloadData或者reloadSections时的刷新的闪烁问题
将你原来的reloadData reloadSections像这样包一下：
[UIView performWithoutAnimation:^{
[self.mainCol performBatchUpdates:^{
[self.mainCol reloadSections:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, self.mainCol.numberOfSections)]];
[self.mainCol reloadEmptyDataSet];
} completion:nil];
}];
最近使用虚线的时候 最开始发现虚线加载不出来，后来仔细想了想，可能是因为要添加虚线的UIView都还没有渲染完毕，所以才没加出来，果然实验了一下就是这样，切记~
- 虚线
/**
在制定的view上添加虚线
@param lineView 需要添加虚线的view
@param lineLength 虚线长度
@param lineSpacing 虚线与虚线之间的间隔
@param lineColor 虚线的颜色
*/
- (void)drawDashLine:(UIView *)lineView lineLength:(int)lineLength lineSpacing:(int)lineSpacing lineColor:(UIColor *)lineColor {
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
[shapeLayer setBounds:lineView.bounds];
[shapeLayer setPosition:CGPointMake(CGRectGetWidth(lineView.frame) / 2, CGRectGetHeight(lineView.frame))];
[shapeLayer setFillColor:[UIColor clearColor].CGColor];
// 设置虚线颜色为
[shapeLayer setStrokeColor:lineColor.CGColor];
// 设置虚线宽度
[shapeLayer setLineWidth:CGRectGetHeight(lineView.frame)];
[shapeLayer setLineJoin:kCALineJoinRound];
// 设置线宽，线间距
[shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:lineLength], [NSNumber numberWithInt:lineSpacing], nil]];
// 设置路径
CGMutablePathRef path = CGPathCreateMutable(); CGPathMoveToPoint(path, NULL, 0, 0); CGPathAddLineToPoint(path, NULL, CGRectGetWidth(lineView.frame), 0); [shapeLayer setPath:path]; CGPathRelease(path);
// 把绘制好的虚线添加上来
[lineView.layer addSublayer:shapeLayer];
}
还是这样使用：
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self drawDashLine:self.alpaLineOne lineLength:4 lineSpacing:1 lineColor:[UIColor blackColor]];
[self drawDashLine:self.alpaLineTwo lineLength:4 lineSpacing:1 lineColor:[UIColor blackColor]];
});
合理使用@autoreleasepool
@autoreleasepool {
NSUInteger userCount = 100;
for (NSUInteger i = 0; i < userCount; i ++) {
@autoreleasepool {
//执行相应的逻辑
//两层autoreleasepool的好处在于：
//内层的auto可以保证每次循环结束后清理一次内存，从而减少内存需求
}
}
}
