Shulou(Shulou.com)06/03 Report--

This article mainly introduces iOS how to achieve font size adaptation, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

The methods are as follows:

Method 1: use macros to define the appropriate font size (according to the 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) {return fontSize-2;} else if (SCREEN_WIDTH==375) {return fontSize;} else {return fontSize+2;}}

Method 2: use macros to define the appropriate font size (according to the screen size)

1.5 represents 6p size when the font is 1.5 times, 5S and 6 size is the same size, can also be customized according to the 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: (using runTime to write classification for UIFont to replace the method that comes with the system) this is recommended.

Class_getInstanceMethod gets the instance method of the class

Class_getClassMethod gets the class method of the class

1. First you need to create a classification for UIFont

two。 The cell phone size width of the prototype drawing designed by UI.

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

UIFont+runtime.m#import "UIFont+runtime.h" # import @ implementation UIFont (runtime) + (void) load {/ / get the replaced class method Method newMethod = class_getClassMethod ([self class], @ selector (adjustFont:)); / / get the pre-replaced class method Method method = class_getClassMethod ([self class], @ selector (systemFontOfSize:)) / / then exchange class methods, exchange IMP pointers 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

Just call the system font setting method normally from the outside.

Just call it normally in the Controller class: UILabel * label = [[UILabel alloc] initWithFrame:CGRectMake (0150, [UIScreen mainScreen] .bounds.size.width, 60)]; label.text = @ "iOS font size fit"; label.font = [UIFont systemFontOfSize:16]; [self.view addSubview:label]

Note:

The load method will only go once. Use runtime's method to replace the method (replace the system method with our own method). Remember to write your own method here, otherwise, after the dead loop, all the places where the systemFontOfSize method is used will be replaced with our own method, that is, you can change the font size. Note: this method can only replace the control font size written in pure code. If you use the control created by xib and set the font size in xib, you can't replace it! You need to manually set the font of the control in the awakeFromNib method of xib

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