股票折线图demo（兼容SDK7编译,ios7）

https://github.com/easyui/StockPlotting

 

////  SPView.m//  StockPlotting////  Created by EZ on 13-11-5.//  Copyright (c) 2013年 cactus. All rights reserved.//#define NLSystemVersionGreaterOrEqualThan(version)  ([[[UIDevice currentDevice] systemVersion] floatValue] >= version)#define IOS7_OR_LATER   NLSystemVersionGreaterOrEqualThan(7.0)#define GraphColor      [[UIColor greenColor] colorWithAlphaComponent:0.5]#define str(index)                                  [NSString stringWithFormat : @"%.f", [[self.values objectAtIndex:(index)] floatValue] * kYScale]#define point(x, y)                                 CGPointMake((x) * kXScale, yOffset + (y) * kYScale)#import "SPView.h"@interface SPView ()@property (nonatomic, strong)   dispatch_source_t timer;@end@implementation SPViewconst CGFloat   kXScale = 15.0;const CGFloat   kYScale = 50.0;static inline CGAffineTransformCGAffineTransformMakeScaleTranslate(CGFloat sx, CGFloat sy,    CGFloat dx, CGFloat dy){    return CGAffineTransformMake(sx, 0.f, 0.f, sy, dx, dy);}- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        // Initialization code    }    return self;}- (void)awakeFromNib{    [self setContentMode:UIViewContentModeRight];    _values = [NSMutableArray array];    __weak id   weakSelf = self;    double      delayInSeconds = 0.25;    self.timer =        dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,            dispatch_get_main_queue());    dispatch_source_set_timer(        _timer, dispatch_walltime(NULL, 0),        (unsigned)(delayInSeconds * NSEC_PER_SEC), 0);    dispatch_source_set_event_handler(_timer, ^{            [weakSelf updateValues];        });    dispatch_resume(_timer);}- (void)updateValues{    double nextValue = sin(CFAbsoluteTimeGetCurrent())        + ((double)rand() / (double)RAND_MAX);    [self.values addObject:    [NSNumber numberWithDouble:nextValue]];    CGSize size = self.bounds.size;    /*     *   UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;     *   if(orientation == UIInterfaceOrientationLandscapeLeft || orientation == UIInterfaceOrientationLandscapeRight){     *     *     *   }     */    CGFloat     maxDimension = size.width; // MAX(size.height, size.width);    NSUInteger  maxValues =        (NSUInteger)floorl(maxDimension / kXScale);    if ([self.values count] > maxValues) {        [self.values removeObjectsInRange:        NSMakeRange(0, [self.values count] - maxValues)];    }    [self setNeedsDisplay];}- (void)dealloc{    dispatch_source_cancel(_timer);}- (void)drawRect:(CGRect)rect{    if ([self.values count] == 0) {        return;    }    CGContextRef ctx = UIGraphicsGetCurrentContext();    CGContextSetStrokeColorWithColor(ctx,        [GraphColor CGColor]);    CGContextSetLineJoin(ctx, kCGLineJoinRound);    CGContextSetLineWidth(ctx, 2);    CGMutablePathRef path = CGPathCreateMutable();    CGFloat             yOffset = self.bounds.size.height / 2;    CGAffineTransform   transform =        CGAffineTransformMakeScaleTranslate(kXScale, kYScale,            0, yOffset);    CGPathMoveToPoint(path, &transform, 0, 0);    CGPathAddLineToPoint(path, &transform, self.bounds.size.width, 0); // self.bounds.size.width其实大了kXScale倍    CGFloat y = [[self.values objectAtIndex:0] floatValue];    CGPathMoveToPoint(path, &transform, 0, y);    [self drawAtPoint:point(0, y) withStr:str(0)];    for (NSUInteger x = 1; x < [self.values count]; ++x) {        y = [[self.values objectAtIndex:x] floatValue];        CGPathAddLineToPoint(path, &transform, x, y);        [self drawAtPoint:point(x, y) withStr:str(x)];    }    CGContextAddPath(ctx, path);    CGPathRelease(path);    CGContextStrokePath(ctx);}- (void)drawAtPoint:(CGPoint)point withStr:(NSString *)str{        if (IOS7_OR_LATER) {       #if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_6_1        [str drawAtPoint:point withAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:8], NSStrokeColorAttributeName:GraphColor}];       #endif    } else {        [str drawAtPoint:point withFont:[UIFont systemFontOfSize:8]];    }     }@end