屏幕適配

• 根據不同的屏幕尺寸，按照等比例縮放生成的對象

#define kScreen_height  [[UIScreen mainScreen] bounds].size.height
#define kScreen_width   [[UIScreen mainScreen] bounds].size.width

• 定義一個基對象

//  4/4s 5/5s 320  6/6s 375  6p/6sp 414   美工給的基本圖，比如基準圖是6，則設置如下
static const CGFloat baseScreenWidth = 320.0f;
//  4/4s 修改480 5/5s 568  6/6s 667  6p/6sp 736
static const CGFloat baseScreenHeight = 568.0f;

• 定義比例

static CGFloat scaleXAndWidth;
static CGFloat scaleYAndHeight;

• 以frame代碼實現為例

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];
    
    scaleXAndWidth = kScreen_width/baseScreenWidth;
    scaleYAndHeight = kScreen_height/baseScreenHeight;
    
    UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(12*scaleXAndWidth, 88*scaleYAndHeight, 296*scaleXAndWidth, 35*scaleYAndHeight)];
    
    btn.backgroundColor = [UIColor redColor];
    [self.view addSubview:btn];
    
}
@end  

如果配合使用Masonry進行適配會快很多 ，Masonry后期再補......因為也挺簡單的，只是需要區別mas_equalTo和equalTo ,項目中用這個開發會比較快