iOS之UILabel字体加粗等属性和特效

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;

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 = UIBaselineAdjustmentNone

typedefenum {

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

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];

#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.html UILabel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UILabel http://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- d02e
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]];
}