ChangeColorLabel
效果
源码
//
// ChangeColorLabel.h
// YXMWeather
//
// Created by XianMingYou on 15/6/22.
// Copyright (c) 2015年 XianMingYou. All rights reserved.
// #import <UIKit/UIKit.h> @interface ChangeColorLabel : UIView @property (nonatomic, strong) UIFont *font;
@property (nonatomic, strong) UIColor *textColor;
@property (nonatomic, strong) UIColor *changedColor; /**
* 文本
*/
@property (nonatomic, strong) NSString *text; /**
* 设定文本后将会重新更新控件
*/
- (void)updateLabelView; /**
* 颜色百分比
*
* @param percent 颜色的百分比
*/
- (void)colorPercent:(CGFloat)percent; @end
//
// ChangeColorLabel.m
// YXMWeather
//
// Created by XianMingYou on 15/6/22.
// Copyright (c) 2015年 XianMingYou. All rights reserved.
// #import "ChangeColorLabel.h"
#import "AlphaView.h"
#import "UIView+SetRect.h" @interface ChangeColorLabel ()
@property (nonatomic, strong) UILabel *showLabel;
@property (nonatomic, strong) UILabel *alphaLabel;
@property (nonatomic, strong) AlphaView *alphaView;
@end @implementation ChangeColorLabel - (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self initLabels];
}
return self;
} - (void)initLabels {
self.showLabel = [[UILabel alloc] initWithFrame:CGRectZero];
[self addSubview:self.showLabel]; self.alphaLabel = [[UILabel alloc] initWithFrame:CGRectZero];
[self addSubview:self.alphaLabel]; // 设定alphaView
self.alphaView = [[AlphaView alloc] initWithFrame:CGRectZero];
self.alphaView.colors = @[[UIColor clearColor],
[UIColor blackColor],
[UIColor blackColor],
[UIColor clearColor]];
self.alphaView.locations = @[@(.f), @(0.05), @(0.95), @(.f)];
self.alphaView.startPoint = CGPointMake(, );
self.alphaView.endPoint = CGPointMake(, );
self.alphaLabel.maskView = self.alphaView;
} /**
* 设定文本后将会重新更新控件
*/
- (void)updateLabelView {
// 字体
UIFont *font = (self.font == nil ? self.showLabel.font : self.font); // 设置文本 + 设置颜色 + 设置字体
self.showLabel.text = self.text;
self.alphaLabel.text = self.text;
self.showLabel.textColor = self.textColor;
self.alphaLabel.textColor = self.changedColor;
self.showLabel.font = font;
self.alphaLabel.font = font; // 重置文本位置
[self.showLabel sizeToFit];
[self.alphaLabel sizeToFit]; // 重新设置alphaView的frame值
self.alphaView.width = self.showLabel.width;
self.alphaView.height = self.showLabel.height;
} /**
* 文本颜色百分比
*
* @param percent 百分比
*/
- (void)colorPercent:(CGFloat)percent {
if (percent <= ) {
self.alphaView.x = -self.showLabel.width;
} else {
self.alphaView.x = -self.showLabel.width + percent * self.showLabel.width;
}
} #pragma mark - 私有方法 @end
//
// AlphaView.h
// YXMWeather
//
// Created by XianMingYou on 15/6/20.
// Copyright (c) 2015年 XianMingYou. All rights reserved.
// #import <UIKit/UIKit.h> @interface AlphaView : UIView @property (nonatomic, strong) NSArray *colors;
@property (nonatomic, strong) NSArray *locations;
@property (nonatomic) CGPoint startPoint;
@property (nonatomic) CGPoint endPoint; - (void)alphaType; @end
//
// AlphaView.m
// YXMWeather
//
// Created by XianMingYou on 15/6/20.
// Copyright (c) 2015年 XianMingYou. All rights reserved.
// #import "AlphaView.h" @interface AlphaView () {
CAGradientLayer *_gradientLayer;
} @end @implementation AlphaView /**
* 修改当前view的backupLayer为CAGradientLayer
*
* @return CAGradientLayer类名字
*/
+ (Class)layerClass {
return [CAGradientLayer class];
} - (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
_gradientLayer = (CAGradientLayer *)self.layer;
}
return self;
} - (void)alphaType {
self.colors = @[[UIColor clearColor], [UIColor blackColor], [UIColor clearColor]];
self.locations = @[@(0.25), @(0.5), @(0.75)];
self.startPoint = CGPointMake(, );
self.endPoint = CGPointMake(, );
} /**
* 重写setter,getter方法
*/
@synthesize colors = _colors;
- (void)setColors:(NSArray *)colors {
_colors = colors; // 将color转换成CGColor
NSMutableArray *cgColors = [NSMutableArray array];
for (UIColor *tmp in colors) {
id cgColor = (__bridge id)tmp.CGColor;
[cgColors addObject:cgColor];
} // 设置Colors
_gradientLayer.colors = cgColors;
}
- (NSArray *)colors {
return _colors;
} @synthesize locations = _locations;
- (void)setLocations:(NSArray *)locations {
_locations = locations;
_gradientLayer.locations = _locations;
}
- (NSArray *)locations {
return _locations;
} @synthesize startPoint = _startPoint;
- (void)setStartPoint:(CGPoint)startPoint {
_startPoint = startPoint;
_gradientLayer.startPoint = startPoint;
}
- (CGPoint)startPoint {
return _startPoint;
} @synthesize endPoint = _endPoint;
- (void)setEndPoint:(CGPoint)endPoint {
_endPoint = endPoint;
_gradientLayer.endPoint = endPoint;
}
- (CGPoint)endPoint {
return _endPoint;
} @end
//
// UIView+SetRect.h
// TestPch
//
// Created by YouXianMing on 14-9-26.
// Copyright (c) 2014年 YouXianMing. All rights reserved.
// #import <UIKit/UIKit.h> @interface UIView (SetRect) // Frame
@property (nonatomic) CGPoint viewOrigin;
@property (nonatomic) CGSize viewSize; // Frame Origin
@property (nonatomic) CGFloat x;
@property (nonatomic) CGFloat y; // Frame Size
@property (nonatomic) CGFloat width;
@property (nonatomic) CGFloat height; // Frame Borders
@property (nonatomic) CGFloat top;
@property (nonatomic) CGFloat left;
@property (nonatomic) CGFloat bottom;
@property (nonatomic) CGFloat right; // Center Point
#if !IS_IOS_DEVICE
@property (nonatomic) CGPoint center;
#endif
@property (nonatomic) CGFloat centerX;
@property (nonatomic) CGFloat centerY; // Middle Point
@property (nonatomic, readonly) CGPoint middlePoint;
@property (nonatomic, readonly) CGFloat middleX;
@property (nonatomic, readonly) CGFloat middleY;
@end
//
// UIView+SetRect.m
// TestPch
//
// Created by YouXianMing on 14-9-26.
// Copyright (c) 2014年 YouXianMing. All rights reserved.
// #import "UIView+SetRect.h" @implementation UIView (SetRect) #pragma mark Frame - (CGPoint)viewOrigin
{
return self.frame.origin;
} - (void)setViewOrigin:(CGPoint)newOrigin
{
CGRect newFrame = self.frame;
newFrame.origin = newOrigin;
self.frame = newFrame;
} - (CGSize)viewSize
{
return self.frame.size;
} - (void)setViewSize:(CGSize)newSize
{
CGRect newFrame = self.frame;
newFrame.size = newSize;
self.frame = newFrame;
} #pragma mark Frame Origin - (CGFloat)x
{
return self.frame.origin.x;
} - (void)setX:(CGFloat)newX
{
CGRect newFrame = self.frame;
newFrame.origin.x = newX;
self.frame = newFrame;
} - (CGFloat)y
{
return self.frame.origin.y;
} - (void)setY:(CGFloat)newY
{
CGRect newFrame = self.frame;
newFrame.origin.y = newY;
self.frame = newFrame;
} #pragma mark Frame Size - (CGFloat)height
{
return self.frame.size.height;
} - (void)setHeight:(CGFloat)newHeight
{
CGRect newFrame = self.frame;
newFrame.size.height = newHeight;
self.frame = newFrame;
} - (CGFloat)width
{
return self.frame.size.width;
} - (void)setWidth:(CGFloat)newWidth
{
CGRect newFrame = self.frame;
newFrame.size.width = newWidth;
self.frame = newFrame;
} #pragma mark Frame Borders - (CGFloat)left
{
return self.x;
} - (void)setLeft:(CGFloat)left
{
self.x = left;
} - (CGFloat)right
{
return self.frame.origin.x + self.frame.size.width;
} - (void)setRight:(CGFloat)right
{
self.x = right - self.width;
} - (CGFloat)top
{
return self.y;
} - (void)setTop:(CGFloat)top
{
self.y = top;
} - (CGFloat)bottom
{
return self.frame.origin.y + self.frame.size.height;
} - (void)setBottom:(CGFloat)bottom
{
self.y = bottom - self.height;
} #pragma mark Center Point #if !IS_IOS_DEVICE
- (CGPoint)center
{
return CGPointMake(self.left + self.middleX, self.top + self.middleY);
} - (void)setCenter:(CGPoint)newCenter
{
self.left = newCenter.x - self.middleX;
self.top = newCenter.y - self.middleY;
}
#endif - (CGFloat)centerX
{
return self.center.x;
} - (void)setCenterX:(CGFloat)newCenterX
{
self.center = CGPointMake(newCenterX, self.center.y);
} - (CGFloat)centerY
{
return self.center.y;
} - (void)setCenterY:(CGFloat)newCenterY
{
self.center = CGPointMake(self.center.x, newCenterY);
} #pragma mark Middle Point - (CGPoint)middlePoint
{
return CGPointMake(self.middleX, self.middleY);
} - (CGFloat)middleX
{
return self.width / ;
} - (CGFloat)middleY
{
return self.height / ;
} @end
使用
//
// ViewController.m
// ChangeColorLabel
//
// Created by YouXianMing on 15/6/25.
// Copyright (c) 2015年 YouXianMing. All rights reserved.
// #import "ViewController.h"
#import "ChangeColorLabel.h"
#import "UIView+SetRect.h" @interface ViewController () <UIScrollViewDelegate> @property (nonatomic, strong) ChangeColorLabel *label; @end @implementation ViewController - (void)viewDidLoad {
[super viewDidLoad]; self.view.backgroundColor = [UIColor blackColor]; self.label = [[ChangeColorLabel alloc] initWithFrame:CGRectMake(, , , )];
self.label.font = [UIFont fontWithName:@"AppleSDGothicNeo-UltraLight" size:.f];
self.label.textColor = [UIColor redColor];
self.label.changedColor = [UIColor purpleColor];
self.label.text = @"YouXianMing";
self.label.center = self.view.center;
self.label.x += ;
[self.label updateLabelView];
[self.view addSubview:self.label];
[self.label colorPercent:]; UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];
scrollView.contentSize = CGSizeMake(self.view.width * , self.view.height);
scrollView.delegate = self;
[self.view addSubview:scrollView]; } - (void)scrollViewDidScroll:(UIScrollView *)scrollView { CGFloat x = scrollView.contentOffset.x;
CGFloat percent = x / self.view.width; [self.label colorPercent:percent];
} @end