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【ObjC】文字跑马灯

作者:佳航 / 发布于2014/11/15/ 656


	#import <UIKit/UIKit.h>
	
	@interface UXLabel : UIView
	{
	 float num;
	 float max;
	 CGRect sFrame;
	}
	@property(nonatomic,retain)NSString* string;
	@property(nonatomic,assign)CGRect stringColor;
	@property(nonatomic,assign)CGFloat stringFont;
	-(void)updateLabel;
	@end
	
	
	
	// Created by 夏科杰 on 13-9-10.
	// Copyright (c) 2013年 卓健科技. All rights reserved.
	//
	
	#import "UXLabel.h"
	@implementation UXLabel
	@synthesize string,stringColor,stringFont;
	- (id)initWithFrame:(CGRect)frame
	{
	 self = [super initWithFrame:frame];
	 if (self) {
	 num=0;
	 sFrame=frame;
	 // Initialization code
	 }
	 return self;
	}
	
	- (void)drawRect:(CGRect)rect
	{
	 num+=0.5;
	 CGContextRef context = UIGraphicsGetCurrentContext();
	 CGContextSetLineWidth(context, 1.0);
	 CGContextSetRGBFillColor (context, stringColor.origin.x, stringColor.origin.y, stringColor.size.width, stringColor.size.height);
	 UIFont *font = [UIFont boldSystemFontOfSize:stringFont];
	 [string drawInRect:CGRectMake(num,0, 320, sFrame.size.height) withFont:font];
	 num=num>sFrame.size.width?-max:num;
	}
	
	-(void)updateLabel
	{
	 max=[string sizeWithFont:[UIFont boldSystemFontOfSize:stringFont] constrainedToSize:CGSizeMake(MAXFLOAT, sFrame.size.height)].width;
	 if(max<sFrame.size.width){return;}
	 [self setNeedsDisplay];
	 [self performSelector:@selector(updateLabel) withObject:nil afterDelay:0.1];
	}
	
	@end

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　文字跑马灯　　跑马灯　

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