在iOS开发中使用iconfont图标

在开发iOS项目时，不可避免的会用到图标，而为了适配不同分辨率的设备，我们通常会需要@2x，@3x两套格式的图片，最明显的就是底部tabBar的图标使用。而对于那些有换肤需求的APP来说，还需要多套图来匹配不同的主题。通过切图的方式制作图标，一方面加大了开发者和设计者的工作量，另一方面也会增大APP的体积。而使用iconfont的可以达到以下目的
1.减小应用体积，字体文件比图片要小；
2.图标保真缩放，解决2x/3x乃至将来nx图问题；
3.方便更改图标颜色大小，图片复用。

所以为了给开发者、设计者稍微减少点工作量，给APP“减重，我们可以将iconfont应用到自己的项目中。那么，iconfont是怎么用的呢？iconfont，从字面上就能理解它就是字体，让开发者像使用字体一样使用图标。

由于我是做开发的，所以对于iconfont的制作并不太熟悉，都是设计师做好了图标给我，如果你想学习iconfont的制作的话，可以去阿里巴巴的iconfont平台去看看，上面有比较全的资料。制作好的iconfont图标是一种.ttf格式的字体，如图：

在iOS开发中使用iconfont图标

iconfont图标

iconfont中的图标是这样的：

在iOS开发中使用iconfont图标

iconfont中的图标

而我们需要的是将.ttf格式的文件引入到自己的工程中

接下来我们借助淘点点科技写的一个关于iconfont封装，方便我们使用iconfont。iconfont的封装包括

在iOS开发中使用iconfont图标

1.TBCityIconInfo.h的实现

 #import <Foundation/Foundation.h> #import <UIKit/UIKit.h>  @interface TBCityIconInfo : NSObject  @property (nonatomic, strong) NSString *text; @property (nonatomic, assign) NSInteger size; @property (nonatomic, strong) UIColor *color;  - (instancetype)initWithText:(NSString *)text size:(NSInteger)size color:(UIColor *)color; + (instancetype)iconInfoWithText:(NSString *)text size:(NSInteger)size color:(UIColor *)color;  @end

2.TBCityFontImageInfo.m的实现

 #import "TBCityIconInfo.h"  @implementation TBCityIconInfo  - (instancetype)initWithText:(NSString *)text size:(NSInteger)size color:(UIColor *)color {     if (self = [super init]) {         self.text = text;         self.size = size;         self.color = color;     }     return self; }  + (instancetype)iconInfoWithText:(NSString *)text size:(NSInteger)size color:(UIColor *)color {     return [[TBCityIconInfo alloc] initWithText:text size:size color:color]; }  @end

3.TBCityIconFont.h的实现

 #import "UIImage+TBCityIconFont.h" #import "TBCityIconInfo.h"  #define TBCityIconInfoMake(text, imageSize, imageColor) [TBCityIconInfo iconInfoWithText:text size:imageSize color:imageColor]  @interface TBCityIconFont : NSObject  + (UIFont *)fontWithSize: (CGFloat)size; + (void)setFontName:(NSString *)fontName;  @end

4.TBCityIconFont.m的实现

 #import "TBCityIconFont.h" #import <CoreText/CoreText.h>  @implementation TBCityIconFont  static NSString *_fontName;  + (void)registerFontWithURL:(NSURL *)url {     NSAssert([[NSFileManager defaultManager] fileExistsAtPath:[url path]], @"Font file doesn't exist");     CGDataProviderRef fontDataProvider = CGDataProviderCreateWithURL((__bridge CFURLRef)url);     CGFontRef newFont = CGFontCreateWithDataProvider(fontDataProvider);     CGDataProviderRelease(fontDataProvider);     CTFontManagerRegisterGraphicsFont(newFont, nil);     CGFontRelease(newFont); }  + (UIFont *)fontWithSize:(CGFloat)size {     UIFont *font = [UIFont fontWithName:[self fontName] size:size];     if (font == nil) {         NSURL *fontFileUrl = [[NSBundle mainBundle] URLForResource:[self fontName] withExtension:@"ttf"];         [self registerFontWithURL: fontFileUrl];         font = [UIFont fontWithName:[self fontName] size:size];         NSAssert(font, @"UIFont object should not be nil, check if the font file is added to the application bundle and you're using the correct font name.");     }     return font; }  + (void)setFontName:(NSString *)fontName {     _fontName = fontName;  }  + (NSString *)fontName {     return _fontName ? : @"iconfont"; }  @end

5.UIImage+TBCityIconFont.h的实现

 #import <UIKit/UIKit.h> #import "TBCityIconInfo.h"  @interface UIImage (TBCityIconFont)  + (UIImage *)iconWithInfo:(TBCityIconInfo *)info;  @end

6.UIImage+TBCityIconFont.m

 #import "UIImage+TBCityIconFont.h" #import "TBCityIconFont.h" #import <CoreText/CoreText.h>  @implementation UIImage (TBCityIconFont)  + (UIImage *)iconWithInfo:(TBCityIconInfo *)info {     CGFloat size = info.size;     CGFloat scale = [UIScreen mainScreen].scale;     CGFloat realSize = size * scale;     UIFont *font = [TBCityIconFont fontWithSize:realSize];     UIGraphicsBeginImageContext(CGSizeMake(realSize, realSize));     CGContextRef context = UIGraphicsGetCurrentContext();      if ([info.text respondsToSelector:@selector(drawAtPoint:withAttributes:)]) {         /**          * 如果这里抛出异常，请打开断点列表，右击All Exceptions -> Edit Breakpoint -> All修改为Objective-C          * See: http://stackoverflow.com/questions/1163981/how-to-add-a-breakpoint-to-objc-exception-throw/14767076#14767076          */         [info.text drawAtPoint:CGPointZero withAttributes:@{NSFontAttributeName:font, NSForegroundColorAttributeName: info.color}];     } else {  #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wdeprecated-declarations"         CGContextSetFillColorWithColor(context, info.color.CGColor);         [info.text drawAtPoint:CGPointMake(0, 0) withFont:font]; #pragma clang pop     }      UIImage *image = [UIImage imageWithCGImage:UIGraphicsGetImageFromCurrentImageContext().CGImage scale:scale orientation:UIImageOrientationUp];     UIGraphicsEndImageContext();      return image; }  @end

7.在AppDelegate.m中，初始化我们的iconfont

 #import "AppDelegate.h" #import "TBCityIconFont.h" #import "ViewController.h" @interface AppDelegate ()  @end  @implementation AppDelegate   - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    //iconfont图标     [TBCityIconFont setFontName:@"iconfont"];     UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:[ViewController new]];     _window.rootViewController = nav;     // Override point for customization after application launch.     return YES; }

8.在ViewController.m中实现

 #import "ViewController.h" #import "TBCityIconFont.h" #import "UIImage+TBCityIconFont.h" @interface ViewController ()  @end  @implementation ViewController  - (void)viewDidLoad {     [super viewDidLoad];     self.view.backgroundColor = [UIColor whiteColor];     self.navigationController.navigationBar.translucent = NO;      UIBarButtonItem *leftBarButton = [[UIBarButtonItem alloc] initWithImage:[ UIImage iconWithInfo:TBCityIconInfoMake(@"/U0000e602",22,[UIColor colorWithRed:0.55 green:0.55 blue:0.55 alpha:1])] style:UIBarButtonItemStylePlain target:self action:@selector(leftButtonAction)];     self.navigationItem.leftBarButtonItem = leftBarButton;       self.navigationItem.leftBarButtonItem.tintColor = [UIColor colorWithRed:0.55 green:0.55 blue:0.55 alpha:1];     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage iconWithInfo:TBCityIconInfoMake(@"/U0000e60d",25, [UIColor colorWithRed:0.14 green:0.61 blue:0.83 alpha:1.00])] style:UIBarButtonItemStylePlain target:self action:@selector(rightButtonAction)];      self.navigationItem.rightBarButtonItem.tintColor = [UIColor colorWithRed:0.14 green:0.61 blue:0.83 alpha:1.00];      // Do any additional setup after loading the view, typically from a nib. }  -(void)loadView{     [super loadView]; //    imageView     UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 50, 30, 30)];     [self.view addSubview:imageView]; //图标编码是&#xe603，需要转成/U0000e603     imageView.image = [UIImage iconWithInfo:TBCityIconInfoMake(@"/U0000e603", 30, [UIColor redColor])]; //    button     UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];     button.frame = CGRectMake(100, 100, 40, 40);     [self.view addSubview:button];     [button setImage:[UIImage iconWithInfo:TBCityIconInfoMake(@"/U0000e60c", 40, [UIColor redColor])] forState:UIControlStateNormal]; //    label,label可以将文字与图标结合一起，直接用label的text属性将图标显示出来     UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(50, 160, 280, 40)];     [self.view addSubview:label];     label.font = [UIFont fontWithName:@"iconfont" size:15];//设置label的字体     label.text = @"这是用label显示的iconfont  /U0000e60c"; } -(void)leftButtonAction{  } -(void)rightButtonAction{  }

9.运行得到的结果如图：

在iOS开发中使用iconfont图标