NSMutableArray * array = [NSMutableArrayarrayWithObjects:@"ad",@"az",@"ac",@"ab",@"aa", nil];
DLog("ar :: %@",array);
[array sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {
return [obj1 localizedStandardCompare:obj2];
}];
DLog("ar :: %@",array);
画线1：
//Define line width and cap
CGContextSetLineWidth(ctx, TB_BACKGROUND_WIDTH);
CGContextSetLineCap(ctx, kCGLineCapButt);
CGPoint p1 = CGPointMake(10, 10);
CGPoint p2 = CGPointMake(40, 10);
CGPoint p3 = CGPointMake(40, 30);
CGPoint p4 = CGPointMake(10, 30);
CGPoint points[4] = {p1,p2,p3,p4};
CGContextAddLines(ctx, points, 3);
画线2：
CGContextAddLineToPoint
比较：http://blog.sina.com.cn/s/blog_67a5e4720100yeky.html