Method1. performSelector方法

Method2. NSTimer定時(shí)器

Method3. NSThread線程的sleep

Method4. GCD

公用延遲執(zhí)行方法

- (void)delayMethod{ NSLog(@"delayMethodEnd");}

Method1:performSelector

[self performSelector:@selector(delayMethod) withObject:nil/*可傳任意類型參數(shù)*/ afterDelay:2.0];
注：此方法是一種非阻塞的執(zhí)行方式，未找到取消執(zhí)行的方法。

程序運(yùn)行結(jié)束
2015-08-31 10:56:59.361 CJDelayMethod[1080:39604] delayMethodStart2015-08-31 10:56:59.363 CJDelayMethod[1080:39604] nextMethod2015-08-31 10:57:01.364 CJDelayMethod[1080:39604] delayMethodEnd

Method2:NSTimer定時(shí)器

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(delayMethod) userInfo:nil repeats:NO];
注：此方法是一種非阻塞的執(zhí)行方式，
取消執(zhí)行方法：- (void)invalidate;即可

程序運(yùn)行結(jié)束
2015-08-31 10:58:10.182 CJDelayMethod[1129:41106] delayMethodStart2015-08-31 10:58:10.183 CJDelayMethod[1129:41106] nextMethod2015-08-31 10:58:12.185 CJDelayMethod[1129:41106] delayMethodEnd

Method3:NSThread線程的sleep

[NSThread sleepForTimeInterval:2.0];
注：此方法是一種阻塞執(zhí)行方式，建議放在子線程中執(zhí)行，否則會(huì)卡住界面。但有時(shí)還是需要阻塞執(zhí)行，如進(jìn)入歡迎界面需要沉睡3秒才進(jìn)入主界面時(shí)。
沒有找到取消執(zhí)行方式。

程序運(yùn)行結(jié)束
2015-08-31 10:58:41.501 CJDelayMethod[1153:41698] delayMethodStart2015-08-31 10:58:43.507 CJDelayMethod[1153:41698] nextMethod

Method4:GCD

__block ViewController/*主控制器*/ *weakSelf = self;

dispatch_time_t delayTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0/*延遲執(zhí)行時(shí)間*/ * NSEC_PER_SEC));dispatch_after(delayTime, dispatch_get_main_queue(), ^{    [weakSelf delayMethod];});`

注：此方法可以在參數(shù)中選擇執(zhí)行的線程，是一種非阻塞執(zhí)行方式。沒有找到取消執(zhí)行方式。

程序運(yùn)行結(jié)束
2015-08-31 10:59:21.652 CJDelayMethod[1181:42438] delayMethodStart2015-08-31 10:59:21.653 CJDelayMethod[1181:42438] nextMethod2015-08-31 10:59:23.653 CJDelayMethod[1181:42438] delayMethodEnd

完整代碼參見：

//
// ViewController.m
// CJDelayMethod
//
// Created by 陳杰 on 8/31/15.
// Copyright (c) 2015 chenjie. All rights reserved.
//

import "ViewController.h"

@interface ViewController ()
@property (nonatomic, strong) NSTimer timer;
@end
@implementation ViewController
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. NSLog(@"delayMethodStart"); [self methodOnePerformSelector];// [self methodTwoNSTimer];// [self methodThreeSleep];// [self methodFourGCD]; NSLog(@"nextMethod");}
- (void)methodFiveAnimation{ [UIView animateWithDuration:0 delay:2.0 options:UIViewAnimationOptionAllowUserInteraction animations:^{ } completion:^(BOOL finished) { [self delayMethod]; }];}
- (void)methodFourGCD{ __block ViewController weakSelf = self; dispatch_time_t delayTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)); dispatch_after(delayTime, dispatch_get_main_queue(), ^{ [weakSelf delayMethod]; });}
- (void)methodThreeSleep{ [NSThread sleepForTimeInterval:2.0];}
- (void)methodTwoNSTimer{ NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(delayMethod) userInfo:nil repeats:NO];}
- (void)methodOnePerformSelector{ [self performSelector:@selector(delayMethod) withObject:nil/*可傳任意類型參數(shù)*/ afterDelay:2.0];}
- (void)delayMethod{ NSLog(@"delayMethodEnd");}
- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end

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