摘要：#import "HMViewController.h"// 1.分别下载2张图片：大图片、LOGO// 2.合并2张图片// 3.显示到一个imageView身上@interface HMViewController ()@property (weak, nonatomic) IBOutlet U... 阅读全文

摘要：延时执行的方法:- (void)delay3{ // 3秒后回到主线程执行block中的代码// dispatch_queue_t queue = dispatch_get_main_queue();// dispatch_after(dispatch_time(DISPATCH_... 阅读全文

摘要：#define HMGlobalQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)#define HMMainQueue dispatch_get_main_queue()#import "HMViewControl... 阅读全文

摘要：GCD的基本使用:- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ // dispatch_sync : 同步，不具备开启线程的能力 // dispatch_async : 异步，具备开启线程的能力 ... 阅读全文

摘要：#import "HMViewController.h"@interface HMViewController ()@property (weak, nonatomic) IBOutlet UIImageView *imageView;@end@implementation HMViewContro... 阅读全文