iOS开发小技巧 – runtime适配字体

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一个iOS开发项目无外乎就是纯代码布局、xib或SB布局。那么如何实现两个方式的字体大小适配呢？

字体大小适配——纯代码

定义一个宏定义如下：

#define SizeScale (SCREEN_WIDTH != 414 ? 1 : 1.2)#define kFont(value) [UIFont systemFontOfSize:value * SizeScale]

宏中的1.2是在plus下的大小放大比例,可以根据自己的实际情况来调整。

纯代码中设置字体大小通过使用这个宏来实现整体适配

字体大小适配——xib或SB

字体大小适配无外乎就是设置UIButton、UILabel、UITextView、UITextField的字体大小

通过创建这几个的类目来实现（Runtime方式的黑魔法method swizzling）

废话不多说，直接上代码：

.h

#import <UIKit/UIKit.h>
#import <objc/runtime.h>/**
 *  button
 */
@interface UIButton (MyFont)@end/**
 *  Label
 */
@interface UILabel (myFont)@end/**
 *  TextField
 */@interface UITextField (myFont)@end/**
 *  TextView
 */
@interface UITextView (myFont)@end

.m

#import "UIButton+MyFont.h"//不同设备的屏幕比例(当然倍数可以自己控制)@implementation UIButton (MyFont)+ (void)load{
    Method imp = class_getInstanceMethod([self class], @selector(initWithCoder:));
    Method myImp = class_getInstanceMethod([self class], @selector(myInitWithCoder:));
    method_exchangeImplementations(imp, myImp);
}- (id)myInitWithCoder:(NSCoder*)aDecode{
    [self myInitWithCoder:aDecode];
    if (self) {        //部分不像改变字体的 把tag值设置成333跳过
        if(self.titleLabel.tag != 333){
            CGFloat fontSize = self.titleLabel.font.pointSize;
            self.titleLabel.font = [UIFont systemFontOfSize:fontSize * SizeScale];
        }
    }
    return self;
}@end@implementation UILabel (myFont)+ (void)load{
    Method imp = class_getInstanceMethod([self class], @selector(initWithCoder:));
    Method myImp = class_getInstanceMethod([self class], @selector(myInitWithCoder:));
    method_exchangeImplementations(imp, myImp);
}- (id)myInitWithCoder:(NSCoder*)aDecode{
    [self myInitWithCoder:aDecode];
    if (self) {
        //部分不像改变字体的 把tag值设置成333跳过
        if(self.tag != 333){
            CGFloat fontSize = self.font.pointSize;
            self.font = [UIFont systemFontOfSize:fontSize * SizeScale];
        }
    }
    return self;
}@end@implementation UITextField (myFont)+ (void)load{
    Method imp = class_getInstanceMethod([self class], @selector(initWithCoder:));
    Method myImp = class_getInstanceMethod([self class], @selector(myInitWithCoder:));
    method_exchangeImplementations(imp, myImp);
}- (id)myInitWithCoder:(NSCoder*)aDecode{
    [self myInitWithCoder:aDecode];
    if (self) {
        //部分不像改变字体的 把tag值设置成333跳过
        if(self.tag != 333){
            CGFloat fontSize = self.font.pointSize;
            self.font = [UIFont systemFontOfSize:fontSize * SizeScale];
        }
    }
    return self;
}@end@implementation UITextView (myFont)+ (void)load{
    Method imp = class_getInstanceMethod([self class], @selector(initWithCoder:));
    Method myImp = class_getInstanceMethod([self class], @selector(myInitWithCoder:));
    method_exchangeImplementations(imp, myImp);
}- (id)myInitWithCoder:(NSCoder*)aDecode{
    [self myInitWithCoder:aDecode];
    if (self) {
        //部分不像改变字体的 把tag值设置成333跳过
        if(self.tag != 333){
            CGFloat fontSize = self.font.pointSize;
            self.font = [UIFont systemFontOfSize:fontSize * SizeScale];
        }
    }
    return self;
}@end