如何解決iOS瀑布流運行不流暢

甚至為了performance，所有的加載操作都在后臺完成，一定要重用：

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在iOS開發(fā)中利用GCD進行多線程編程

iOS開發(fā)中使用NSOperationQueue進行多線程操作

避免后臺加載完成多個資源之后集中到達占用UI線程的處理時間太長。

這一點可以通過dispatch或者performSelectorInBackground或者NSOperationQueue來實現(xiàn)。

創(chuàng)建cell一般是很慢的。

重用cell解決辦法

主要要做到一下幾個方面，且在每個操作完成之后進行強制等待。

這一點可以通過NSOperationQueue來實現(xiàn)。見：

除了UI部分，可以用usleep(int microSeconds)來解決，將資源到UI的展現(xiàn)過程放在隊列中逐個執(zhí)行，可以在view創(chuàng)建之初就創(chuàng)建足夠多的cell在重用隊列中

ios mbprogresshudmodedeterminate 怎么動畫

，然后把兩個MBProgressHUD.h和MBProgressHUD.m放到自己的項目就可以了。這里有一個小Demo可以參考一下。

頭文件部分：

#import UIKit/UIKit.h#import "MBProgressHUD.h"@interface ViewController : UIViewController{ MBProgressHUD *HUD;}- (IBAction)showTextDialog:(id)sender; //文本提示框，默認情況下- (IBAction)showProgressOne:(id)sender; //第一種加載提示框- (IBAction)showProgressTwo:(id)sender; //第二種加載提示框- (IBAction)showProgressThree:(id)sender; //第三種加載提示框- (IBAction)showCustomDialog:(id)sender; //自定義提示框，顯示打鉤效果- (IBAction)showAllTextDialog:(id)sender; //顯示純文本提示框@end

實現(xiàn)文件部分

#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad{ [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib.}- (void)didReceiveMemoryWarning{ [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}- (IBAction)showTextDialog:(id)sender { HUD = [[MBProgressHUD alloc] initWithView:self.view]; [self.view addSubview:HUD]; HUD.dimBackground = YES; //把當前的view置于后臺 HUD.labelText = @"請稍等"; //顯示對話框 [HUD showAnimated:YES whileExecutingBlock:^{ sleep(3); } completionBlock:^{ }];}- (IBAction)showProgressOne:(id)sender { HUD = [[MBProgressHUD alloc] initWithView:self.view]; [self.view addSubview:HUD]; HUD.labelText = @"正在加載"; HUD.mode = MBProgressHUDModeDeterminate; //HUD.mode = MBProgressHUDModeAnnularDeterminate; [HUD showAnimated:YES whileExecutingBlock:^{ float progress = 0.0f; while (progress 1.0f) { progress += 0.01f; HUD.progress = progress; usleep(5000); } } completionBlock:^{ [HUD removeFromSuperview]; [HUD release]; HUD = nil; }];}- (IBAction)showProgressTwo:(id)sender { HUD = [[MBProgressHUD alloc] initWithView:self.view]; [self.view addSubview:HUD]; HUD.labelText = @"正在加載"; HUD.mode = HUD.mode = MBProgressHUDModeAnnularDeterminate; [HUD showAnimated:YES whileExecutingBlock:^{ float progress = 0.0f; while (progress 1.0f) { progress += 0.01f; HUD.progress = progress; usleep(5000); } } completionBlock:^{ [HUD removeFromSuperview]; [HUD release]; HUD = nil; }];}- (IBAction)showProgressThree:(id)sender { HUD = [[MBProgressHUD alloc] initWithView:self.view]; [self.view addSubview:HUD]; HUD.labelText = @"正在加載"; HUD.mode = MBProgressHUDModeDeterminateHorizontalBar; [HUD showAnimated:YES whileExecutingBlock:^{ float progress = 0.0f; while (progress 1.0f) { progress += 0.01f; HUD.progress = progress; usleep(5000); } } completionBlock:^{ [HUD removeFromSuperview]; [HUD release]; HUD = nil; }];}- (IBAction)showCustomDialog:(id)sender { HUD = [[MBProgressHUD alloc] initWithView:self.view]; [self.view addSubview:HUD]; HUD.labelText = @"操作成功"; HUD.mode = MBProgressHUDModeCustomView; HUD.customView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Checkmark"]] autorelease]; [HUD showAnimated:YES whileExecutingBlock:^{ sleep(2); } completionBlock:^{ [HUD removeFromSuperview]; [HUD release]; HUD = nil; }];}- (IBAction)showAllTextDialog:(id)sender { HUD = [[MBProgressHUD alloc] initWithView:self.view]; [self.view addSubview:HUD]; HUD.labelText = @"操作成功"; HUD.mode = MBProgressHUDModeText; HUD.customView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Checkmark"]] autorelease]; [HUD showAnimated:YES whileExecutingBlock:^{ sleep(2); } completionBlock:^{ [HUD removeFromSuperview]; [HUD release]; HUD = nil; }]; }- (void)dealloc { [super dealloc];}@end

當前名稱：ios開發(fā)usleep,IOS開發(fā)者模式
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