:Several methods of iOS font size adaptation-empirical point of view免费ppt模版下载-道格办公

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In iOS development, some companies also have requirements for font adaptation. In order to make the font beautiful, the font size must be adapted on screens of different sizes.
I have summarized several methods for your reference.

Method 1: Use macro definition to adapt font size (judged according to screen size)

//macro definition
#define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)
# define FONT_SIZE(size) ([UIFont systemFontOfSize:FontSize(size))

/**
 * Font Adaptation I defined a method in the PCH file
 */
static inline CGFloat FontSize(CGFloat fontSize ){
 if (SCREEN_WIDTH==320) {< br> return fontSize-2;
 }else  if (SCREEN_WIDTH==375){
 return fontSize;
 }else{
 return fontSize+< span class='hljs-number' >2;
 }
}

Method 2: Use macro definition to adapt font size (judged according to screen size)

1.5 means that the font size is 1.5 times that of the 6P size, and the size of the 5S and 6 sizes is the same. You can also customize the ratio according to your needs.

The code is as follows:

#define IsIphone6P SCREEN_WIDTH ==414
#define SizeScale (IsIphone6P ? 1.5 : 1) 
#define kFontSize(value) value*SizeScale
#define kFont(value) [UIFont systemFontOfSize:value*SizeScale]

Method 3: (Use runTime to write categories to UIFont to replace the method that comes with the system) It is recommended to use this

class_getInstanceMethod gets the instance method of the class

class_getClassMethod gets the class method of the class

First you need to create a UIFont category
Mobile phone size and width of your own UI design prototype

#define MyUIScreen 375 // The mobile phone size width of the UI design prototype (6), 6p--414

UIFont+runtime.m

#import 'UIFont+runtime.h '
#import <objc/runtime.h>

@implementation UIFont ( runtime)

+ (void)load {
 < span class='hljs-comment' >// Get the replaced class method
 Method newMethod = class_getClassMethod([self class], @selector(adjustFont:));
 // Get Class method before replacement
 Method method = class_getClassMethod([self class], @selector(systemFontOfSize:));
 // Then exchange the class method, exchange the IMP pointer of the two methods, (IMP represents the specific implementation of the method)
 method_exchangeImplementations(newMethod, method);
}

+ (UIFont *)adjustFont:(CGFloat)fontSize {
 UIFont *newFont = nil;
 newFont = [UIFont adjustFont:fontSize * [UIScreen mainScreen].bounds.size.width/MyUIScreen];
 return newFont;
}
@end

Externally call the system to set the font method normally

Just call it normally in the Controller class:

UILabel *label = [[ UILabel alloc]initWithFrame:CGRectMake(0, 150, [UIScreen mainScreen].bounds.size.width, 60)]; 
label.text = @'iOS font size adaptation';
label.font = [UIFont< /span> systemFontOfSize:16];
[self.view addSubview:label];

Note:

The load method will only go once, and use the runtime method to replace the method.

In the replacement method (replace the system method with our own method), remember to write your own method here, otherwise there will be an endless loop. Afterwards, wherever the systemFontOfSize method is used, it will be replaced by our own method, and the font size can be changed

Note: This method can only replace the font size of the control written in pure code. If you create a control with xib and set the font size in xib, then it cannot be replaced! You need to manually set the control font in the awakeFromNib method of xib

Author: Dark Blue_S
Link: https://www.jianshu.com/p/7a6106f952d3

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