开发中，都会有适应各种屏幕尺寸的需要，因为4s年代久远，本文中就没有针对4s的适配（其实屏幕宽度和5s一样，开发中按5s的适配参数来就行了，高度适配的话就把页面调成滑动的就好了），话不多说，先上适配参数，
let iphone5 = UIScreen.instancesRespond(to:#selector(getter: UIScreen.main.currentMode)) ? __CGSizeEqualToSize(CGSize(width:960,height:1336), (UIScreen.main.currentMode?.size)!) : falselet iphone6 = UIScreen.instancesRespond(to:#selector(getter: UIScreen.main.currentMode)) ? __CGSizeEqualToSize(CGSize(width:750,height:1334), (UIScreen.main.currentMode?.size)!) : falselet iphone6p = UIScreen.instancesRespond(to:#selector(getter: UIScreen.main.currentMode)) ? __CGSizeEqualToSize(CGSize(width:1242,height:2208), (UIScreen.main.currentMode?.size)!) : falselet iphone6pBigMode = UIScreen.instancesRespond(to:#selector(getter: UIScreen.main.currentMode)) ? __CGSizeEqualToSize(CGSize(width:1125,height:2001), (UIScreen.main.currentMode?.size)!) : falselet iphoneX = UIScreen.instancesRespond(to:#selector(getter: UIScreen.main.currentMode)) ? __CGSizeEqualToSize(CGSize(width:1125,height:2436), (UIScreen.main.currentMode?.size)!) : false//适配参数let suitParm:CGFloat = (iphone6p ? 1.12 : (iphone6 ? 1.0 : (iphone6pBigMode ? 1.01 : (iphoneX ? 1.0 : 0.85))))复制代码
接下来只需要在NSLayoutConstraint的extension中添加以下代码，就能在XIB中动态的控制约束的屏幕尺寸适配
import Foundationimport UIKitextension NSLayoutConstraint { @IBInspectable var adapterScreen: Bool { get { return true } set { if newValue { self.constant = self.constant * suitParm } } } }复制代码 因为get是用不到的，所以随便返回了个true 好了，现在我们就可以在XIB上找到我们设置的属性了 选中一个约束后
/* iOS设备 */#define kDevice_Is_iPhone4s ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)#define kDevice_Is_iPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) : NO)#define kDevice_Is_iPhone6 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(750, 1334), [[UIScreen mainScreen] currentMode].size) : NO)#define kDevice_Is_iPhone6Plus ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(1242, 2208), [[UIScreen mainScreen] currentMode].size) : NO)#define iPhone6PlusBigMode ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(1125, 2001), [[UIScreen mainScreen]currentMode].size) : NO)//适配参数#define KsuitParam (kDevice_Is_iPhone6Plus ?1.12:(kDevice_Is_iPhone6?1.0:(iPhone6PlusBigMode ?1.01:0.85))) //以6为基准图复制代码
新建OC文件 NSLayoutConstraint+IBDesignable 在NSLayoutConstraint+IBDesignable.h里
#import@interface NSLayoutConstraint (IBDesignable)@property(nonatomic, assign) IBInspectable BOOL adapterScreen;@end复制代码
在NSLayoutConstraint+IBDesignable.m文件里
#import "NSLayoutConstraint+IBDesignable.h"@implementation NSLayoutConstraint (IBDesignable)- (void)setAdapterScreen:(BOOL)adapterScreen{if adapterScreen{ self.constant = self.constant * KsuitParam;}}- (BOOL)adapterScreen{ return YES;}@end复制代码 让大家看看效果 5、5s或者SE：
6、7或者6s：
一些小东西，希望对大家有帮助