設計思路：調整contentSize即可：

本例未採用分類 ，而用子類擴充套件的方法，原始碼如下：

#import <UIKit/UIKit.h>


typedef NS_ENUM(NSInteger, Oritation) {
    
    horizontal = 1,
    vertical,
    
};

/**
 解決自適應滾動
 */
@interface AutoLayoutScrollView : UIScrollView



/**
 自適應內容滾動尺寸

 @param type 滾動方向
 */
-(void) autoContentSize:(Oritation) type;

@end
 

#import "AutoLayoutScrollView.h"

@implementation AutoLayoutScrollView


-(void) autoContentSize:(Oritation) type{

    CGFloat width = 0;
    CGFloat height= 0;
    
    for (UIView* view in self.subviews){
        height += view.frame.size.height;
        width += view.frame.size.width;
    }

    switch (type) {
            
        case horizontal:{
            self.contentSize = CGSizeMake(width, 0.0f);
        }
            break;
            
        case vertical:{
            
            self.contentSize = CGSizeMake(0.0f, height);
            
        }break;
            
        default:
            break;
    }
    
}



@end
 

測試程式碼：在vc中

  AutoLayoutScrollView* scrollView = [[AutoLayoutScrollView alloc] initWithFrame:CGRectMake(20, 50, 300, 300)];
    //scrollView.contentSize = CGSizeMake(300, 500);
    scrollView.backgroundColor = [UIColor grayColor];
    [self.view addSubview:scrollView];
    
    
    for(int i=0;i<7;i++){
        
        UILabel* test = [[UILabel alloc] initWithFrame:CGRectMake(0, 40 * i, 100, 50)];
        test.text = [NSString stringWithFormat:@"test:%d",i];
        [scrollView addSubview:test];
    }
    [scrollView autoContentSize:vertical];