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