IOS 不在主线程操作UI
This application is modifying the autolayout engine from a background thread after the engine was accessed from the main thread, this can lead to engine corruption and weird crashes.
在子线程中操作UI相关的操作了;
修改方式,将操作UI的代码块(注意代码块里不能有return)放到如下宏定义里
#ifndef dispatch_main_async_safe #define dispatch_main_async_safe(block)\ if (dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL) == dispatch_queue_get_label(dispatch_get_main_queue())) {\ block();\ } else {\ dispatch_async(dispatch_get_main_queue(), block);\ } #endif
//主线程同步队列 https://blog.csdn.net/qq_26341621/article/details/50156157 #define dispatch_main_sync_safe(block)\ if ([NSThread isMainThread]) {\ block();\ } else {\ dispatch_sync(dispatch_get_main_queue(), block);\ } //主线程异步队列 #define dispatch_main_async_safe(block)\ if ([NSThread isMainThread]) {\ block();\ } else {\ dispatch_async(dispatch_get_main_queue(), block);\ } //用法 dispatch_main_async_safe(^{ //需要执行的代码片段; });
如果你放到代码块中的代码有return操作,就会报错: