dvlprliu

typedef NS_ENUM(NSUInteger, SectionHeaderType) {
    SectionHeaderTypeHeader,
    SectionHeaderTypeFooter
};

/**
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
    
    SectionHeader *header = [tableView dequeueReusableHeaderFooterViewWithIdentifier:REUSED_HEADER_ID];

dvlprliu

protocol Identifiable {
    associatedtype Identifier: Equatable
    var id: Identifier { get }
}

extension CollectionType where Generator.Element: Identifiable {

    func indexOf(element: Self.Generator.Element) -> Self.Index? {
        return self.indexOf { $0.id == element.id }
    }

dvlprliu

- (void)animateFromPoint:(CGPoint)startPoint toPoint:(CGPoint)endPoint duration:(CGFloat)duration {
    NSLog(@"------%s-------",__func__);
    CGFloat r = sqrtf(powf(startPoint.x - endPoint.x, 2) + powf(startPoint.y - endPoint.y, 2));
    
    NSLog(@"r = %f",r);
    
    CGFloat SIN = (startPoint.y - endPoint.y) / r;
    CGFloat COS = (startPoint.x - endPoint.x) / r;
    
    NSLog(@"-----------------");

dvlprliu

- (void)shakenAView:(UIView *)view {

    CGPoint leftPoint = CGPointMake(view.center.x - 3, view.center.y);
    CGPoint rightPoint = CGPointMake(view.center.x + 3, view.center.y);
    
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, view.center.x, view.center.y);
    CGPathAddLineToPoint(path, NULL, leftPoint.x, leftPoint.y);
    CGPathAddLineToPoint(path, NULL, rightPoint.x, rightPoint.y);
    CGPathAddLineToPoint(path, NULL, leftPoint.x, rightPoint.y);