在iOS开发中使用iconfont图标
wmhh5430
8年前
<p>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<br> 1.减小应用体积，字体文件比图片要小；<br> 2.图标保真缩放，解决2x/3x乃至将来nx图问题；<br> 3.方便更改图标颜色大小，图片复用。</p> <p>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。</p> <p>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：</p> <p style="text-align: center;"><img alt="在iOS开发中使用iconfont图标" src="https://simg.open-open.com/show/83e3d34e534df86f704f3b5582f3ee6c.png"></p> <p style="text-align: center;">iconfont图标</p> <p>iconfont中的图标是这样的：</p> <p style="text-align: center;"><img alt="在iOS开发中使用iconfont图标" src="https://simg.open-open.com/show/6ac3f7c9a3088f1ef3623c9670b445c6.png"></p> <p style="text-align: center;">iconfont中的图标</p> <p>而我们需要的是将.ttf格式的文件引入到自己的工程中</p> <p>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</p> <p><img alt="在iOS开发中使用iconfont图标" src="https://simg.open-open.com/show/838147ef8265d0441a91cdb2c0aec434.png"></p> <p>1.TBCityIconInfo.h的实现</p> <pre> <code class="language-objectivec">#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</code></pre> <p>2.TBCityFontImageInfo.m的实现</p> <pre> <code class="language-objectivec">#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</code></pre> <p>3.TBCityIconFont.h的实现</p> <pre> <code class="language-objectivec">#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</code></pre> <p>4.TBCityIconFont.m的实现</p> <pre> <code class="language-objectivec">#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</code></pre> <p>5.UIImage+TBCityIconFont.h的实现</p> <pre> <code class="language-objectivec">#import <UIKit/UIKit.h> #import "TBCityIconInfo.h" @interface UIImage (TBCityIconFont) + (UIImage *)iconWithInfo:(TBCityIconInfo *)info; @end</code></pre> <p>6.UIImage+TBCityIconFont.m</p> <pre> <code class="language-objectivec">#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</code></pre> <p>7.在AppDelegate.m中，初始化我们的iconfont</p> <pre> <code class="language-objectivec">#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; }</code></pre> <p>8.在ViewController.m中实现</p> <pre> <code class="language-objectivec">#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，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{ }</code></pre> <p>9.运行得到的结果如图：</p> <p><img alt="在iOS开发中使用iconfont图标" src="https://simg.open-open.com/show/20e8eda3d1110b1570acef12b61e2fc5.png"></p> <p>这样，我们就可以很方便的使用iconfont图标了。这里要注意的是，图标是用的iconfont中的图标用的是unicode编码，我们在自己的工程中时需要将&#xXXXX格式转换成\UXXXXXXXX格式。</p> <p><br> <a href="/misc/goto?guid=4959675321378533941">阅读原文</a></p> <p> </p>