简介

在做ios开发的过程中，总会遇到一些用约束无法解决适配问题的情况，这个时候我们要计算出位置，然后手动的用代码控制控件的适配问题。

适配规则类的实现

#import <Foundation/Foundation.h>

typedef NS_ENUM(NSUInteger, ScreenModel) {
    ScreenModelInch35 = 0, //(320 * 480)
    ScreenModelInch4,//(320 * 570)
    ScreenModelBigger, //(375)
    ScreenModelPlus //(414)
};

//首先写一个方法来判断目前屏幕的尺寸
static inline ScreenModel calScreenModel(){
    NSInteger nativeWidth = [UIScreen mainScreen].bounds.size.width;
    
    if (nativeWidth <= 320){
        CGFloat nativeHeight = [UIScreen mainScreen].bounds.size.height;
        if (nativeHeight > 480){
            return ScreenModelInch4;
        }
        return ScreenModelInch35;
    }
    
    if (nativeWidth <= 375){
        return ScreenModelBigger;
    }
    
    return ScreenModelPlus;
}

@interface Ruler : NSObject
@property (nonatomic, strong) id inch35; //3.5
@property (nonatomic, strong) id inch4; //4.0
@property (nonatomic, strong) id inchBigger;//4.7
@property (nonatomic, strong) id inchPlus; //5.5

@property (nonatomic, assign, readonly) id value;
@end

//外部运用的方法，四个参数分别是不同尺寸屏幕，手动想控制的值
static inline Ruler* rulerMake(id inch35,id inch4,id inchBigger,id inchPlus){
    Ruler *ruler = [[Ruler alloc] init];
    ruler.inch35 = inch35;
    ruler.inch4 = inch4;
    ruler.inchBigger = inchBigger;
    ruler.inchPlus = inchPlus;
    return ruler;
}

#import "Ruler.h"

@implementation Ruler

//在value的getter方法里给来判断要返回给页面要用的值
- (id)value{
    ScreenModel screenModel = calScreenModel();
    switch (screenModel) {
        case ScreenModelInch35:
            return self.inch35;
            break;
        case ScreenModelInch4:
            return self.inch4;
            break;
        case ScreenModelBigger:
            return self.inchBigger;
            break;
        case ScreenModelPlus:
            return self.inchPlus;
            break;
            
        default:
            break;
    }
    return nil;
}

@end

这样就可以根据不同的屏幕尺寸设置不同的位置了。
还有本文用到了内联函数，内联函数的用处就不多说了，贴个链接吧。
(inline)内联函数在IOS开发中的使用