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(lèi)型參數(shù)*/ afterDelay:2.0];
注：此方法是一種非阻塞的執(zhí)行方式乌叶，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] delayMethodStart 2015-08-31 10:56:59.363 CJDelayMethod[1080:39604] nextMethod 2015-08-31 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)行方式思喊，
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] delayMethodStart 2015-08-31 10:58:10.183 CJDelayMethod[1129:41106] nextMethod 2015-08-31 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)行方式涯鲁，建議放在子線程中執(zhí)行醉冤，否則會(huì)卡住界面袜漩。但有時(shí)還是需要阻塞執(zhí)行涮俄，如進(jìn)入歡迎界面需要沉睡3秒才進(jìn)入主界面時(shí)夫偶。
沒(méi)有找到取消執(zhí)行方式界睁。
程序運(yùn)行結(jié)束
2015-08-31 10:58:41.501 CJDelayMethod[1153:41698] delayMethodStart 2015-08-31 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)行的線程觉增，是一種非阻塞執(zhí)行方式兵拢。沒(méi)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] delayMethodStart 2015-08-31 10:59:21.653 CJDelayMethod[1181:42438] nextMethod 2015-08-31 10:59:23.653 CJDelayMethod[1181:42438] delayMethodEnd
完整代碼參見(jiàn)：
//
//? 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(lèi)型參數(shù)*/ afterDelay:2.0]; }
- (void)delayMethod{ NSLog(@"delayMethodEnd"); }
- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end
