iOS上如何使用iconfont圖標

作者：JackerooChu來源：https://www.jianshu.com/p/0e899abe6bbc

1.什麼是iconfont

iconFont拆開來看，就是 Icon + Font，這樣估計大家應該都能理解是什麼，那兩者結合是什麼呢？沒錯！就是 IconFont ！讓開發者像使用字體一樣使用圖標。如果自己不會做的話，可以直接去阿里的iconfont圖標庫下載自己需要的圖標。

2.爲什麼要使用iconfont

在開發項目時，不可避免的會用到各種圖標，爲了適配不同的設備，通常需要@2x和@3x兩套圖，例如說我們tabBar上使用的圖標。有些app有換膚的需要，還需要多套不同的圖來進行匹配不同的主題。如果使用切圖，這對於設計和開發來說無疑是增加了工作量，而且ipa的體積也會增大。

使用iconfont的好處:

減小ipa包的大小
圖標保真縮放，多設備適配一套圖解決問題
適應換膚要求，使用方便。

3.怎麼用iconfont

1. 首先去iconfont圖標庫下載自己需要的圖標。

如圖我們可以選擇自己需要的icon加入到購物車，然後加入項目裏，當然你也可以直接在購物車直接下載，但是這樣只是沒有修改icon爲自己想要的樣式，加入項目中，你可以自己任意修改icon爲自己想要的樣式。

注意：這裏是下載代碼，這樣我們就可以在項目中直接使用

2.將下載下來的icon資源添加到自己的項目中。

我們所需要的就是這個iconfont.ttf，對於這個ttf文件，我想我們並不陌生吧。新建項目，將這個ttf文件拖入自己的項目裏。

注意：勾選如圖選項

接下來配置項目加載這個文件

檢查文件是否在項目中，不然會崩潰

在plist文件中加入字體

接下來我們藉助淘點點科技寫的一個關於iconfont封裝，方便我們使用iconfont。iconfont的封裝包括

1.TBCityIconInfo.h的實現

#import 
#import 
@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.TBCityIconInfo.m的實現

#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的實現

#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;

4.TBCityIconFont.m的實現

#import "TBCityIconFont.h"
#import 
@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的實現

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

6.UIImage+TBCityIconFont.m的實現

#import "UIImage+TBCityIconFont.h"
#import "TBCityIconFont.h"
#import 
@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:)]) {
 /**
 * 如果這裏拋出異常，請打開斷點列表，右擊All Exceptions -> Edit Breakpoint -> All修改爲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

3.具體使用方法

1.在AppDelegate.m中，初始化iconfont

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

2.在ViewController.m中實現

#import "ViewController.h"
#import "TBCityIconFont.h"
#import "UIImage+TBCityIconFont.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
 [super viewDidLoad];
 self.view.backgroundColor = [UIColor whiteColor];
 UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 30, 30)];
 [self.view addSubview:imageView];
 //圖標編碼是，需要轉成U0000e600
 imageView.image = [UIImage iconWithInfo:TBCityIconInfoMake(@"U0000e600", 30, [UIColor redColor])];
 // button
 UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
 button.frame = CGRectMake(100, 150, 40, 40);
 [self.view addSubview:button];
 [button setImage:[UIImage iconWithInfo:TBCityIconInfoMake(@"U0000e614", 40, [UIColor redColor])] forState:UIControlStateNormal];
 // label,label可以將文字與圖標結合一起，直接用label的text屬性將圖標顯示出來
 UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(50, 200, 280, 40)];
 [self.view addSubview:label];
 label.font = [UIFont fontWithName:@"iconfont" size:15];//設置label的字體
 label.text = @"在lable上顯示 U0000e658";
 // Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
 [super didReceiveMemoryWarning];
 // Dispose of any resources that can be recreated.
}
@end