Iphone 应用程序:-我的应用程序崩溃 [英] Iphone Application:-My Application Crash

问题描述

我制作了一个这样的自定义单元格类.

I make one custom cell class like this.

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {

self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {

    /*imgview=[[UIImageView alloc]initWithFrame:CGRectMake(10, 15, 40, 20)];
    imgview.backgroundColor = [UIColor clearColor];
    imgview.opaque = NO;*/

    Name = [[UILabel alloc]initWithFrame:CGRectMake(75, 10, 130, 30)];
    Name.backgroundColor = [UIColor clearColor];
    Name.textColor=[UIColor blueColor];
    Name.font=[UIFont fontWithName:@"Arial" size:16.0];
    Name.textAlignment=NSTextAlignmentLeft;

    CGSize textSize = [[Name text] sizeWithFont:[Name font]];
    CGFloat strikeWidth = textSize.width;
    ScreenName =[[UILabel alloc]initWithFrame:CGRectMake(strikeWidth+75.0, 25  , 150, 40)];
    ScreenName.backgroundColor = [UIColor clearColor];
    ScreenName.textColor=[UIColor redColor];
    ScreenName.font=[UIFont fontWithName:@"Arial" size:16.0];
    ScreenName.textAlignment=NSTextAlignmentLeft;

    tweetview=[[UITextView alloc]initWithFrame:CGRectMake(75, 50, 200, 70)];
    tweetview.backgroundColor = [UIColor clearColor];
    tweetview.textColor=[UIColor redColor];
    tweetview.font=[UIFont fontWithName:@"Arial" size:16.0];        
    tweetview.textAlignment=NSTextAlignmentLeft;
    tweetview.editable=NO;
    tweetview.dataDetectorTypes=UIDataDetectorTypeLink;

    Minutes=[[UILabel alloc]initWithFrame:CGRectMake(270, 20, 150, 50)];
    Minutes.backgroundColor = [UIColor clearColor];
    Minutes.textColor=[UIColor blueColor];
    Minutes.font=[UIFont fontWithName:@"Arial" size:14.0];
    Minutes.textAlignment=NSTextAlignmentLeft;

    //  [self.contentView addSubview:imgview];
    [self.contentView addSubview:Name];
    [self.contentView addSubview:ScreenName];
    [self.contentView addSubview:Minutes];

    //  [self.contentView addSubview:LastTweet];
    [self.contentView addSubview:tweetview];

}

return self;
}

并在 nextviewcontroller.m 实例方法 tableView:didSelectRowAtIndexPath: 中使用它，如下所示:

and use it in nextviewcontroller.m instance method tableView:didSelectRowAtIndexPath: like this:

CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
   // cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]autorelease];
        cell = [[[CustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]autorelease];

}

我的应用程序每次收到消息都会崩溃

my application is crashing every time with message

Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now...

推荐答案

这是因为您正在后台线程上进行一些 UI 更改.在 ios 中，您不能在后台线程上执行任何 UI 更改，这会导致您的应用崩溃.

This is because you are doing some UI changes on background thread. In ios you can not perform any UI changes on background thread , this will crash your app.

所以你必须在主线程上进行 UI 更改

So you have to do your UI changes on main thread

[self performSelectorOnMainThread:@selector(doYourUIChanges:) withObject:nil waitUntilDone:YES];  

或者

dispatch_async(dispatch_get_main_queue(), ^{ 
//Your Task
});

或

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    // background code
});

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