我们在一些统计,理财应用中,经常能看到很多的柱状图,用来直观的标注信息,最近一个朋友刚好在做这方面的应用,跑来问我这个怎么实现,我笑他不就是简单的实现一个动画嘛,额,然后自己去做的时候才发现各种坑.
1.所有的UIView子类中,UILabel不能实现效果
2.创建View和对View实现的动画效果要放在一个方法中
3.增加的height和减少的top(顶部y坐标)必须成2倍关系 或者 增加的height和增加的bottom(底部y坐标)必须成2倍关系
@最后,直接上代码,大家可以去试验下,我也不太清楚究竟是什么原理,有了解的欢迎给我留言
#import "HMTRootViewController.h" #import "UIViewAdditions.h" @interface HMTRootViewController () @property (nonatomic, strong)NSMutableArray *imageArray; @property (nonatomic, strong)NSArray *urlArray; @property (nonatomic, strong)UIView *columnarView; // 柱状图 @end @implementation HMTRootViewController - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. #pragma mark - 一个bug,创建view必须和动画增高在同一个方法里面 self.columnarView = [[UIView alloc] initWithFrame:CGRectMake(10, 100, 40, 10)]; self.columnarView.backgroundColor = [UIColor redColor]; [self.view addSubview:_columnarView]; // 用来对比,columnarView是否发生了偏移 UIView *aa = [[UIView alloc] initWithFrame:CGRectMake(50, 150, 40, 10)]; aa.backgroundColor = [UIColor brownColor]; [self.view addSubview:aa]; UIButton * button = [UIButton buttonWithType:UIButtonTypeSystem]; button.frame = CGRectMake(100, 510, 80, 40); [button setTitle:@"生成" forState:UIControlStateNormal]; [button addTarget:self action:@selector(onClickTextButton) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button]; [UIView animateWithDuration:2 animations:^{ // 增加的height和减少的top(顶部y坐标)必须成2倍关系,才能保持动画的一致 self.columnarView.height += 100; self.columnarView.top -= 50; } completion:^(BOOL finished) { }]; } - (void)onClickTextButton{ self.columnarView = [[UIView alloc] initWithFrame:CGRectMake(150, 100, 40, 10)]; self.columnarView.backgroundColor = [UIColor redColor]; [self.view addSubview:_columnarView]; [UIView animateWithDuration:2 animations:^{ // 增加的height和增加的bottom(底部y坐标)必须成2倍关系,才能保持动画的一致 self.columnarView.height += 100; self.columnarView.bottom = 160; // self.columnarView.bottom += 50 不能实现 } completion:^(BOOL finished) { }]; }
从下往上增加的柱状图生成动画(适用于统计类应用),布布扣,bubuko.com
原文地址:http://blog.csdn.net/hmt20130412/article/details/31769899