iOS之UILabel字体加粗等属性和特效

UILabel垂直居上对齐[label sizeToFit];

//设置文字过长时的显示格式

label.lineBreakMode = UILineBreakModeWordWrap;typedefenum {    UILineBreakModeWordWrap =0,           // Wrap at word boundaries    UILineBreakModeCharacterWrap,          // Wrap at character boundaries    UILineBreakModeClip,           //截去多余部分 Simply clip when it hits the end of the rect截去多余部分     UILineBreakModeHeadTruncation, //截去头部Truncate at head of line: "...wxyz". Will truncate multiline text on first line    UILineBreakModeTailTruncation,//截去尾部 Truncate at tail of line: "abcd...". Will truncate multiline text on last line    UILineBreakModeMiddleTruncation,//截去中间 Truncate middle of line:  "ab...yz". Will truncate multiline text in the middle} UILineBreakMode;

//设置label的行数，这个可以根据上节的UITextView自适应高度

label.numberOfLines = 2;label.lineBreakMode = UILineBreakModeWordWrap;label.textAlignment =  UITextAlignmentCenter;//设置文字对齐位置，居左，居中，居右 label.text = @ "123" ;//设置显示文字 //设置文字颜色，可以有多种颜色可以选择label.textColor = [UIColor whiteColor];label.backgroundColor = [UIColor blackColor];//设置字体:粗体，正常的是 SystemFontOfSize，调用系统的字体配置 label.font = [UIFont boldSystemFontOfSize:20];label.font = [UIFont fontWithName:@ "Arial Rounded MT Bold"  size:(36.0)];//[UIFont fontWithName:@ "Arial" size:14.0]]; //非加粗//设置文本是否高亮和高亮时的颜色scoreLabel.highlighted = YES; scoreLabel.highlightedTextColor = [UIColor orangeColor]; //设置阴影的颜色和阴影的偏移位置 scoreLabel.shadowColor = [UIColor redColor]; scoreLabel.shadowOffset = CGSizeMake(1.0,1.0); //设置是否能与用户进行交互 scoreLabel.userInteractionEnabled = YES;  //设置label中的文字是否可变，默认值是YES  scoreLabel.enabled = NO;//设置字体大小是否适应label宽度 label.adjustsFontSizeToFitWidth = YES; //如果adjustsFontSizeToFitWidth属性设置为YES，这个属性就来控制文本基线的行为coreLabel.baselineAdjustment = UIBaselineAdjustmentNonetypedefenum {    UIBaselineAdjustmentAlignBaselines =0,// default. used when shrinking text to position based on the original baseline    UIBaselineAdjustmentAlignCenters,    UIBaselineAdjustmentNone,} UIBaselineAdjustment;//最小文字号数minimumFontSize设置背景色为透明 scoreLabel.backgroudColor=[UIColor clearColor];自定义的颜色：scoreLabel.backgroudColor=[UIColor clearColor];UIColor *color = [UIColor colorWithRed:1.0f green:50.0f blue:0.0f alpha:1.0f];scoreLabel.textColor = [UIColor color]//UIColor 里的 RGB 值是CGFloat类型的在0～1范围内，对应0～255的颜色值范围。- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines;//改变绘文字属性.重写时调用super可以按默认图形属性绘制,若自己完全重写绘制函数，就不用调用super了.- (void)drawTextInRect:(CGRect)rect;eg：UILabel *label = [[UILabelalloc] initWithFrame:CGRectMake(0, 0, 75, 40)];   //声明UIlbel并指定其位置和长宽 label.backgroundColor = [UIColorclearColor];   //设置label的背景色，这里设置为透明色。 label.font = [UIFont fontWithName:@"Helvetica-Bold" size:13];   //设置label的字体和字体大小。//lable的旋转 label.transform = CGAffineTransformMakeRotation(0.1);     //设置label的旋转角度 label.text = @“helloworld”;   //设置label所显示的文本 label.textColor = [UIColorwhiteColor];    //设置文本的颜色 label.shadowColor = [UIColorcolorWithWhite:0.1falpha:0.8f];    //设置文本的阴影色彩和透明度。 label.shadowOffset = CGSizeMake(2.0f, 2.0f);     //设置阴影的倾斜角度。 label.textAlignment = UITextAlignmentCenter;     //设置文本在label中显示的位置，这里为居中。//换行技巧：如下换行可实现多行显示，但要求label有足够的宽度。 label.lineBreakMode = UILineBreakModeWordWrap;     //指定换行模式 label.numberOfLines = 2;    // 指定label的行数

让label自适应里面的文字，自动调整宽度和高度的

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0,0,0,0)];这个frame是初设的，没关系，后面还会重新设置其size。[label setNumberOfLines:0];NSString *s = @"string......";UIFont *font = [UIFont fontWithName:@"Arial" size:12];CGSize size = CGSizeMake(320,2000);CGSize labelsize = [s sizeWithFont:font constrainedToSize:size lineBreakMode:UILineBreakModeWordWrap];[label setFrame:CGRectMake:(0,0, labelsize.width, labelsize.height)];[self.view addSubView:label];

这样就可以对s赋值让其自动调整其大小了。

UILabel跑马灯效果

//http://www.cocoachina.com/bbs/read.php?tid=74540

#import <UIKit/UIKit.h>@interface TextFlowView : UIView {    //显示文本的标签    UILabel *_firstLabel;    UILabel *_secondLabel;    //定时器    NSTimer *_timer;    //显示的文本    NSString *_text;    //是否需要滚动    BOOL _needFlow;    //控件的框架大小    CGRect _frame;    //文本的字体    UIFont *_font;    //当前第一个控件的索引    NSInteger _startIndex;    //定时器每次执行偏移后，累计的偏移量之和    CGFloat _XOffset;    //文本显示一行，需要的框架大小    CGSize _textSize;}- (id)initWithFrame:(CGRect)frame Text:(NSString *)text;- (void)setFont:(UIFont *)font;- (void)setText:(NSString *)text;@end

//////////////////////////////////////////////////////////////////////////////////

#import "TextFlowView.h"@implementation TextFlowView#pragma mark -#pragma mark 内部调用#define SPACE_WIDTH 50#define LABEL_NUM 2//改变一个TRect的起始点位置，但是其终止店点的位置不变，因此会导致整个框架大小的变化- (CGRect)moveNewPoint:(CGPoint)point rect:(CGRect)rect{    CGSize tmpSize;    tmpSize.height = rect.size.height + (rect.origin.y - point.y);    tmpSize.width = rect.size.width + (rect.origin.x - point.x);    returnCGRectMake(point.x, point.y, tmpSize.width, tmpSize.height);}//开启定时器- (void)startRun{    _timer = [NSTimerscheduledTimerWithTimeInterval:0.02target:selfselector:@selector(timerAction) userInfo:nilrepeats:YES];}//关闭定时器- (void)cancelRun{    if (_timer)     {        [_timerinvalidate];    }}//定时器执行的操作- (void)timerAction{    staticCGFloat offsetOnce = -1;    _XOffset += offsetOnce;    if (_XOffset +  _textSize.width <= 0)     {        _XOffset += _textSize.width;        _XOffset += SPACE_WIDTH;    }    [selfsetNeedsDisplay];}//计算在给定字体下，文本仅显示一行需要的框架大小- (CGSize)computeTextSize:(NSString *)text{    if (text == nil)     {        returnCGSizeMake(0, 0);    }    CGSize boundSize = CGSizeMake(10000, 100);    CGSize stringSize = [_textsizeWithFont:_fontconstrainedToSize:boundSize lineBreakMode:UILineBreakModeWordWrap];    return stringSize;}- (id)initWithFrame:(CGRect)frame Text:(NSString *)text{    self = [superinitWithFrame:frame];    if (self)     {        _text = [text retain];        _frame = frame;        //默认的字体大小        _font = [UIFontsystemFontOfSize:16.0F];        self.backgroundColor = [UIColorredColor];        //初始化标签        //判断是否需要滚动效果        _textSize = [selfcomputeTextSize:text];        //需要滚动效果        if (_textSize.width > frame.size.width)         {            _needFlow = YES;            [selfstartRun];        }    }    returnself;}// Only override drawRect: if you perform custom drawing.// An empty implementation adversely affects performance during animation.- (void)drawRect:(CGRect)rect{    CGContextRef context= UIGraphicsGetCurrentContext();    CGContextSetFillColorWithColor(context, [UIColorwhiteColor].CGColor);    // Drawing code    CGFloat startYOffset = (rect.size.height - _textSize.height)/2;    CGPoint origin = rect.origin;    if (_needFlow == YES)     {//        NSLog(@"OFFSETX:%f", _XOffset);//        NSLog(@"textwidth:%f",_textSize.width);        rect = [selfmoveNewPoint:CGPointMake(_XOffset, startYOffset) rect:rect];//        NSLog(@"rect X:%f  Y:%f",rect.origin.x, rect.origin.y);//        NSLog(@"rect W:%f  H:%f", rect.size.width, rect.size.height);        while (rect.origin.x <= rect.size.width+rect.origin.x)         {            [_textdrawInRect:rect withFont:_font];            rect = [selfmoveNewPoint:CGPointMake(rect.origin.x+_textSize.width+SPACE_WIDTH, rect.origin.y) rect:rect];//            NSLog(@"inner->rect X:%f  Y:%f",rect.origin.x, rect.origin.y);//            NSLog(@"inner->rect W:%f  H:%f", rect.size.width, rect.size.height);        }    }    else    {        //在控件的中间绘制文本        origin.x = (rect.size.width - _textSize.width)/2;        origin.y = (rect.size.height - _textSize.height)/2;        rect.origin = origin;        [_textdrawInRect:rect withFont:_font];    }}- (void)dealloc{    [_textrelease];    [superdealloc];}

#pragma mark -#pragma mark 外部调用- (void)setFont:(UIFont *)font{    _font = font;}- (void)setText:(NSString *)text{    [_textrelease];    _text = [text retain];}@end美化UILabel中的字体代码分享 http://www.devdiv.com/iOS_iPhone-%E7%BE%8E%E5%8C%96UILabel%E4%B8%AD%E7%9A%84%E5%AD%97%E4%BD%93%E4%BB%A3%E7%A0%81%E5%88%86%E4%BA%AB-thread-122319-1-1.htmlUILabel跑马灯效果http://hi.baidu.com/suxinde2009/blog/item/5bcd0e60dd9bb77f0d33fac3.html分享一个可垂直顶端对齐的UILabelhttp://www.devdiv.com/%E5%88%86%E4%BA%AB%E4%B8%80%E4%B8%AA%E5%8F%AF%E5%9E%82%E7%9B%B4%E9%A1%B6%E7%AB%AF%E5%AF%B9%E9%BD%90%E7%9A%84UILabel-weblog-64796-7239.html让UILabel具有链接功能，点击后调用safari打开网址[objc] view plain copy在CODE上查看代码片派生到我的代码片    //侬侬官网连接            UILabel *labelGovUrl = [[UILabel alloc] initWithFrame:CGRectMake(73.0, 330.0, 180.0, 40.0)];            labelGovUrl.autoresizingMask = (UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight);            labelGovUrl.text = @"侬侬官网 >";            labelGovUrl.backgroundColor = [UIColor clearColor];            labelGovUrl.textColor = [UIColor whiteColor];            labelGovUrl.font = [UIFont fontWithName:@"Helvetica-Bold" size:14];            labelGovUrl.userInteractionEnabled = YES;            labelGovUrl.tag = K_NNGOV_WEBSITE_LABEL_URL;            UITapGestureRecognizer *tapGesture =            [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(openURL:)] autorelease];            [labelGovUrl addGestureRecognizer:tapGesture];            [self.view addSubview:labelGovUrl];            [labelGovUrl release];        -(void)openURL:(UITapGestureRecognizer *)gesture{            NSInteger tag = gesture.view.tag;            NSString *url = nil;            if (tag == K_NNWEIBO_LABEL_URL) {                url = @"http://t.qq.com/yourgame/";            }            if(tag == K_NNGOV_WEBSITE_LABEL_URL){                url = @"http://www.zjnn.cn/";            }            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:url]];        }