我想在将文件上传到服务器时显示UIProgressView。因此，我正在编写自定义视图（BlurBg）。它包含UILabel，UITextfield和UIProgressView。我正在动态创建它们。这是工作。但进度条没有更新。我知道我必须更新主线程中的进度条，但我不知道我该怎么做。这是我的代码。
当我触摸按钮时，它正在调用[self startTheBackgroundJob]
- (void)startTheBackgroundJob {
BlurBG *bg = [[BlurBG alloc]init];
[bg showAlert:self];
[self performSelectorOnMainThread:@selector(startIt:) withObject:bg waitUntilDone:NO];
}
-(void)startIt:(BlurBG*)bg{
[bg ProgressUpdate];
}
BlurBG.h
#import <UIKit/UIKit.h>
@interface BlurBG : UIViewController
- (void)showAlert:(UIViewController *)vc;
-(void) ProgressUpdate ;
@end
BlurBG.m
#import "BlurBG.h"
#import "UIImage+ImageEffects.h"
#import <AVFoundation/AVFoundation.h>
#define UIColorFromRGB(rgbValue) [UIColor \
colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 \
green:((float)((rgbValue & 0xFF00) >> 8))/255.0 \
blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]
#define SYSTEM_VERSION_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)
#define KEYBOARD_HEIGHT 80
#define PREDICTION_BAR_HEIGHT 40
@interface BlurBG ()
@property (nonatomic, strong) UIImageView *backgroundView;
@property (nonatomic, strong) UIView *contentView;
@property (nonatomic, strong) UIButton *OkBtn;
@property UIProgressView *prog;
@property (nonatomic) CGFloat backgroundOpacity;
@property UILabel *labelTitle;
@property UITextView *viewText;
@end
@implementation BlurBG
CGFloat kWindowWidth;
CGFloat kWindowHeight;
CGFloat kTextHeight;
CGFloat kSubTitleHeight;
#pragma mark - Initialization
- (id)initWithCoder:(NSCoder *)aDecoder
{
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:@"NSCoding not supported"
userInfo:nil];
}
-(instancetype) init{
self = [super init];
if (self)
{
kWindowWidth = [UIScreen mainScreen].bounds.size.width-50;
kWindowHeight = ([UIScreen mainScreen].bounds.size.height/5);
_OkBtn = [[UIButton alloc] initWithFrame:CGRectMake(kWindowWidth-25,5,20,20)];
_OkBtn.backgroundColor=[UIColor grayColor];
[_OkBtn setTitle:@"X" forState:UIControlStateNormal];
_OkBtn.layer.cornerRadius = 1;
_OkBtn.clipsToBounds = YES;
[_OkBtn addTarget:self action:@selector(fadeOut) forControlEvents:UIControlEventTouchUpInside];
_prog = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
_prog.progressTintColor=[UIColor colorWithRed:187.0/255 green:160.0/255 blue:209.0/255 alpha:1.0];
[[_prog layer]setCornerRadius:10.0f];
[[_prog layer]setBorderWidth:2.0f];
[[_prog layer]setMasksToBounds:TRUE];
_prog.clipsToBounds = YES;
[_prog.layer setBorderColor:[UIColor redColor].CGColor];
_labelTitle = [[UILabel alloc] init];
_viewText = [[UITextView alloc] init];
_contentView = [[UIView alloc] init];
[self.view addSubview:_contentView];
[_contentView addSubview:_labelTitle];
[_contentView addSubview:_viewText];
[_contentView addSubview:_prog];
[_contentView addSubview:_OkBtn];
// Content View
_contentView.layer.cornerRadius = 5.0f;
_contentView.layer.masksToBounds = YES;
_contentView.layer.borderWidth = 0.5f;
_labelTitle.numberOfLines = 1;
_labelTitle.textAlignment = NSTextAlignmentCenter;
_labelTitle.font = [UIFont fontWithName:@"HelveticaNeue" size:20.0f];
// View text
_viewText.editable = NO;
_viewText.allowsEditingTextAttributes = YES;
_viewText.textAlignment = NSTextAlignmentCenter;
_viewText.font = [UIFont fontWithName:@"HelveticaNeue" size:14.0f];
_backgroundView = [[UIImageView alloc]initWithFrame:[UIScreen mainScreen].bounds];
_backgroundView.userInteractionEnabled = YES;
_contentView.backgroundColor = [UIColor whiteColor];
_labelTitle.textColor = UIColorFromRGB(0x4D4D4D);
_viewText.textColor = UIColorFromRGB(0x4D4D4D);
_contentView.layer.borderColor = UIColorFromRGB(0xCCCCCC).CGColor;
}
return self;
}
-(void) ShowTitle:(UIViewController *)vc{
UIWindow *window = [[UIApplication sharedApplication] keyWindow];
self.view.alpha = 0;
[self makeBlurBackground];
_backgroundView.frame = vc.view.bounds;
_labelTitle.text = @"Title";
_viewText.text = @"Description..";
[window addSubview:_backgroundView];
[window addSubview:self.view];
[vc addChildViewController:self];
[self fadeIn];
}
- (void)showAlert:(UIViewController *)vc {
[self ShowTitle:vc];
}
-(void)viewWillLayoutSubviews
{
[super viewWillLayoutSubviews];
CGSize sz = [UIScreen mainScreen].bounds.size;
if (SYSTEM_VERSION_LESS_THAN(@"8.0"))
{
if UIInterfaceOrientationIsLandscape([[UIApplication sharedApplication] statusBarOrientation])
{
CGSize ssz = sz;
sz = CGSizeMake(ssz.height, ssz.width);
}
}
CGRect newFrame = self.backgroundView.frame;
newFrame.size = sz;
self.backgroundView.frame = newFrame;
CGRect r;
if (self.view.superview != nil)
{
r = CGRectMake((sz.width-kWindowWidth)/2, (sz.height-kWindowHeight)/2, kWindowWidth, kWindowHeight/2);
}
else
{
r = CGRectMake((sz.width-kWindowWidth)/2, -kWindowHeight, kWindowWidth, kWindowHeight);
}
self.view.frame = r;
_contentView.frame = CGRectMake(0,0, kWindowWidth, kWindowHeight);
_labelTitle.frame = CGRectMake((kWindowWidth-(kWindowWidth-10))/2, 5, kWindowWidth-10,28);
_viewText.frame = CGRectMake((kWindowWidth-(kWindowWidth-10))/2, 8+(_labelTitle.frame.size.height), kWindowWidth-10,28);
_prog.frame = CGRectMake((kWindowWidth-(kWindowWidth-10))/2, 65, kWindowWidth-10,28);
}
- (void)fadeIn
{
self.backgroundView.alpha = 0.0f;
self.view.alpha = 0.0f;
[UIView animateWithDuration:0.3f
delay:0.0f
options:UIViewAnimationOptionCurveEaseIn
animations:^{
self.backgroundView.alpha = _backgroundOpacity;
self.view.alpha = 1.0f;
}
completion:^(BOOL completed){
//[self performSelectorOnMainThread:@selector(ProgressAyarla) withObject:nil waitUntilDone:YES];
}];
}
- (void)fadeOut
{
[UIView animateWithDuration:0.3f animations:^{
self.backgroundView.alpha = 0.0f;
self.view.alpha = 0.0f;
} completion:^(BOOL completed) {
[self.backgroundView removeFromSuperview];
[self.view removeFromSuperview];
[self removeFromParentViewController];
}];
}
- (void)makeBlurBackground
{
UIImage *image = [UIImage convertViewToImage];
UIImage *blurSnapshotImage = [image applyBlurWithRadius:5.0f
tintColor:[UIColor colorWithWhite:0.2f
alpha:0.7f]
saturationDeltaFactor:1.8f
maskImage:nil];
_backgroundView.image = blurSnapshotImage;
_backgroundView.alpha = 0.0f;
_backgroundOpacity = 1.0f;
}
-(void) ProgressUpdate {
for (int i=0; i<100; i++) {
[NSThread sleepForTimeInterval:0.3];
float currentProgress = _prog.progress;
NSLog(@"%i",i);
[_prog setProgress:currentProgress+1.0 animated:YES];
};
}
@end
答案 0 :(得分：3)
请问这个代码吗？
dispatch_queue_t queue = dispatch_queue_create("your-app-name", NULL);
dispatch_async(queue, ^{
//Create your BlurBG Class.
BlurBG *bg = [[BlurBG alloc]init];
[bg showAlert:self];
dispatch_async(dispatch_get_main_queue(), ^{
//Update UI
[bg ProgressUpdate];
});
});
答案 1 :(得分：2)
通常我使用这种方法在主线程中对UI元素执行某些操作，以防止排队操作到队列末尾。 dispatch_async在主线程中立即执行操作，如果我是正确的。
__weak typeof(self) weakSelf = self;
dispatch_async(dispatch_get_main_queue(), ^{
__strong typeof(weakSelf) strongSelf = weakSelf;
if (strongSelf) {
[strongSelf.prog setProgress:currentProgress + 1.f animated:YES];
}
});