指定了具有 UIProgressView 的 UIScrollView 的滚动

Question

我想在导航栏下添加一个进度条，它将指示UIScrollView滚动的进度，我使用(不工作)：我做

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
self.progressView.progress = scrollView.contentOffset.y;
}

Answer 1

现在检查我创建了一个演示：

#import "ViewController.h"
@interface ViewController ()<UIScrollViewDelegate>{
UIScrollView *scroll;
UIProgressView *indicater;
}
@end
@implementation ViewController

- (void)viewDidLoad {
indicater=[[UIProgressView alloc]initWithFrame:CGRectMake(0, 65, 320,10)];
indicater.backgroundColor=[UIColor redColor];
indicater.progress = 0.0;
indicater.hidden=false;

[self.view addSubview:indicater];
scroll=[[UIScrollView alloc]initWithFrame:CGRectMake(10, 80,300, 200)];
scroll.backgroundColor=[UIColor greenColor];
scroll.userInteractionEnabled=YES;
scroll.delegate=self;
scroll.contentSize = CGSizeMake(300 ,5000);
[self.view addSubview:scroll];

}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
CGPoint offset = scroll.contentOffset;
CGRect bounds = scroll.bounds;
CGSize size = scroll.contentSize;
UIEdgeInsets inset = scroll.contentInset;
float y = offset.y + bounds.size.height - inset.bottom;
float h = size.height;
NSLog(@"%f",y);
NSLog(@"%f",h);
NSNumber *num=[NSNumber numberWithFloat:y];
NSNumber *num1=[NSNumber numberWithFloat:h];

[self UpdateProgressbar:num TotalscrollLenrth:num1];
}
-(void)UpdateProgressbar:(NSNumber*)currentscrollLenrth TotalscrollLenrth:(NSNumber*)n
{
NSString *totalLength = [NSString stringWithFormat:@"%@", n];
NSLog(@"%@", totalLength);
NSString *currentScrool = [NSString stringWithFormat:@"%@", currentscrollLenrth];
NSLog(@"%@", currentScrool);
if (currentscrollLenrth <= n) {
[indicater setProgress:([currentScrool intValue]/[totalLength floatValue])];
}
else {
// do somithig
}
}