//
//  LiveScaleLabel.h
//  ShowLabel
//
//  Created by XianMingYou on 15/1/26.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import <UIKit/UIKit.h>@interface LiveScaleLabel : UIView@property (nonatomic) CGFloat beginScaleValue;
@property (nonatomic) CGFloat endScaleValue;@property (nonatomic, strong) UIColor  *normalStateColor;
@property (nonatomic, strong) UIColor  *maxStateColor;@property (nonatomic, strong) NSString *text;
@property (nonatomic, strong) UIFont   *font;@property (nonatomic) CGFloat sensitiveValue; // 敏感的值
@property (nonatomic) CGFloat currentValue;   // 当前值- (void)buildView;
- (void)accessCurrentValue:(CGFloat)currentValue;@end

//
//  LiveScaleLabel.m
//  ShowLabel
//
//  Created by XianMingYou on 15/1/26.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import "LiveScaleLabel.h"@interface LiveScaleLabel ()@property (nonatomic, strong) UILabel *label;
@property (nonatomic, strong) UIView  *snapView;
@property (nonatomic, strong) UILabel *maxLabel;@end@implementation LiveScaleLabel- (instancetype)initWithFrame:(CGRect)frame {if (self = [super initWithFrame:frame]) {[self setUpLabelWithFrame:self.bounds];}return self;
}- (void)setUpLabelWithFrame:(CGRect)frame {self.label                  = [[UILabel alloc] initWithFrame:frame];self.label.textAlignment    = NSTextAlignmentCenter;self.maxLabel               = [[UILabel alloc] initWithFrame:frame];self.maxLabel.textAlignment = NSTextAlignmentCenter;
}- (void)buildView {UIColor *normalStateColor = (self.normalStateColor == nil ? [UIColor blackColor] : self.normalStateColor);UIColor *maxStateColor    = (self.maxStateColor == nil ? [UIColor redColor] : self.maxStateColor);UIFont  *font             = (self.font == nil ? [UIFont systemFontOfSize:16.f] : self.font);NSString *text            = (self.text == nil ? @"" : self.text);// 设置基本样式self.label.text      = text;self.label.textColor = normalStateColor;self.label.font      = font;self.maxLabel.text      = text;self.maxLabel.textColor = maxStateColor;self.maxLabel.font      = font;// 截图
    [self addSubview:self.label];[self addSubview:self.maxLabel];// 设定起始状态值
    [self accessCurrentValue:self.currentValue];
}- (void)accessCurrentValue:(CGFloat)currentValue {CGFloat beginScaleValue = (self.beginScaleValue <= 0 ? 1.f : self.beginScaleValue);CGFloat endScaleValue   = (self.endScaleValue   <= 0 ? 1.f : self.endScaleValue);CGFloat sensitiveValue  = (self.sensitiveValue  <= 0 ? 320 : self.sensitiveValue);CGFloat percent = currentValue / sensitiveValue;if (percent >= 1) {percent = 1;} else if (percent <= 0) {percent = 0;}self.transform      = CGAffineTransformMake(beginScaleValue + percent * endScaleValue, 0, 0,beginScaleValue + percent * endScaleValue, 0, 0);self.maxLabel.alpha = percent;self.label.alpha    = 1 - percent;
}@end

//
//  ViewController.m
//  ShowLabel
//
//  Created by XianMingYou on 15/1/26.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import "ViewController.h"
#import "LiveScaleLabel.h"@interface ViewController ()<UIScrollViewDelegate>@property (nonatomic, strong) UIScrollView   *scrollView;
@property (nonatomic, strong) LiveScaleLabel *liveLabelLeft;
@property (nonatomic, strong) LiveScaleLabel *liveLabelRight;
@property (nonatomic, strong) UIView         *lineView;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];self.view.backgroundColor = [UIColor blackColor];// 左侧viewself.liveLabelLeft                  = [[LiveScaleLabel alloc] initWithFrame:CGRectMake(0, 300, 160, 30)];self.liveLabelLeft.normalStateColor = [UIColor grayColor];self.liveLabelLeft.text             = @"YouXianMing";self.liveLabelLeft.endScaleValue    = 0.2;self.liveLabelLeft.sensitiveValue   = 320;[self.liveLabelLeft buildView];[self.liveLabelLeft accessCurrentValue:320];[self.view addSubview:self.liveLabelLeft];// 右侧viewself.liveLabelRight                  = [[LiveScaleLabel alloc] initWithFrame:CGRectMake(160, 300, 160, 30)];self.liveLabelRight.text             = @"NoZuoNoDie";self.liveLabelRight.normalStateColor = [UIColor grayColor];self.liveLabelRight.maxStateColor    = [UIColor cyanColor];self.liveLabelRight.endScaleValue    = 0.2;self.liveLabelRight.sensitiveValue   = 320;[self.liveLabelRight buildView];[self.view addSubview:self.liveLabelRight];self.scrollView                                = [[UIScrollView alloc] initWithFrame:self.view.bounds];self.scrollView.delegate                       = self;self.scrollView.pagingEnabled                  = YES;self.scrollView.showsHorizontalScrollIndicator = NO;self.scrollView.contentSize                    = CGSizeMake(self.scrollView.frame.size.width * 2,self.scrollView.frame.size.height);[self.view addSubview:self.scrollView];// 线条viewself.lineView            = [[UIView alloc] initWithFrame:CGRectMake(0, 300 + 30, 160, 1)];UIView *backView         = [[UIView alloc] initWithFrame:CGRectMake(20, 0, 120, 1)];backView.backgroundColor = [UIColor yellowColor];[self.lineView addSubview:backView];[self.view addSubview:self.lineView];
}- (void)scrollViewDidScroll:(UIScrollView *)scrollView {CGFloat x = scrollView.contentOffset.x;[self.liveLabelLeft  accessCurrentValue:320 - x];[self.liveLabelRight accessCurrentValue:x];CGRect rect = self.lineView.frame;rect.origin.x      = x / 2.f;self.lineView.frame = rect;
}@end