iOS动态计算UIScrollView的contentSize示例(页面由Label组成)

 1 #import "ViewController.h"
 2
 3 @interface ViewController ()
 4 {
 5     UIScrollView *_scrollView;
 6 }
 7 //数据源
 8 @property (nonatomic,strong)NSArray *dataArray;
 9
10 @end
11
12 @implementation ViewController
13
14 - (void)viewDidLoad {
15     [super viewDidLoad];
16
17     NSString *path = [[NSBundle mainBundle] pathForResource:@"statuses" ofType:@"plist"];
18     _dataArray = [NSArray arrayWithContentsOfFile:path];
19
20     CGFloat height = 0;
21
22     _scrollView = [[UIScrollView alloc] init];
23     _scrollView.translatesAutoresizingMaskIntoConstraints = NO;
24     [self.view addSubview:_scrollView];
25
26     NSArray *consScrHor = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[_scrollView]-0-|" options:NSLayoutFormatAlignmentMask metrics:nil views:NSDictionaryOfVariableBindings(_scrollView)];
27     [self.view addConstraints:consScrHor];
28
29     NSArray *consScrVor = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[_scrollView]-0-|" options:NSLayoutFormatAlignmentMask metrics:nil views:NSDictionaryOfVariableBindings(_scrollView)];
30     [self.view addConstraints:consScrVor];
31
32     for (NSDictionary *dict in _dataArray) {
33         //CGSize size = [dict[@"text"] boundingRectWithSize:[UIScreen mainScreen].bounds.size options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:16.0]} context:nil].size;
34         //NSLog(@"size:%@",NSStringFromCGSize(size));
35
36         UILabel *toolLabel = [[UILabel alloc] init];
37         toolLabel.text = dict[@"text"];
38         toolLabel.numberOfLines = 0;
39         CGSize size = [toolLabel sizeThatFits:CGSizeMake([UIScreen mainScreen].bounds.size.width, MAXFLOAT)];
40         toolLabel.frame = CGRectMake(0, height, 375, size.height);
41
42         toolLabel.backgroundColor = [UIColor orangeColor];
43         [_scrollView addSubview:toolLabel];
44
45         height+=size.height;
46
47         UIView *spaceView = [[UIView alloc] initWithFrame:CGRectMake(0, height, 375, 30)];
48         spaceView.backgroundColor = [UIColor yellowColor];
49         [_scrollView addSubview:spaceView];
50         height+=30;
51
52         NSLog(@"%@",dict[@"text"]);
53         NSLog(@"%@",NSStringFromCGSize(size));
54     }
55
56     _scrollView.contentSize = CGSizeMake(375, height);
57
58 }
59
60 - (void)didReceiveMemoryWarning {
61     [super didReceiveMemoryWarning];
62     // Dispose of any resources that can be recreated.
63 }
64
65 @end