ios中object c纯代码开发屏幕适配处理方法

 1 #import <UIKit/UIKit.h>
 2 
 3 @interface AppDelegate : UIResponder <UIApplicationDelegate>
 4 
 5 @property (strong, nonatomic) UIWindow *window;
 6 
 7 
 8 @property(nonatomic,assign)CGFloat autoSizeScaleX;
 9 @property(nonatomic,assign)CGFloat autoSizeScaleY;
10 
11 @end

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    self.autoSizeScaleX = [UIScreen mainScreen].bounds.size.width/375;
    self.autoSizeScaleY = [UIScreen mainScreen].bounds.size.height/667;
    
    
    return YES;
}@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    [btn setTitle:@"登陆" forState:UIControlStateNormal];
    [btn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    btn.frame = CGRectMake1(20, 20, 335, 300);
    btn.backgroundColor = [UIColor greenColor];
    [self.view addSubview:btn];
}

//创建内联函数 (在程序编译的时候执行,在函数前声明后编译器执行起来更具效率，使宏的定义更节省，不涉及栈的操作)
CG_INLINE CGRect
CGRectMake1(CGFloat x,CGFloat y,CGFloat width,CGFloat height)
{
    //创建appDelegate 在这不会产生类的对象,(不存在引起循环引用的问题)
    AppDelegate *app = [UIApplication sharedApplication].delegate;
    
    //计算返回
    return CGRectMake(x * app.autoSizeScaleX, y * app.autoSizeScaleY, width * app.autoSizeScaleX, height * app.autoSizeScaleY);
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

@end