我们知道UIAlertView使用delegate返回数据实现的，使用麻烦，之前介绍过用Block实现的例子《ios实战-使用Block的UIAlertView》
今天介绍使用runloop实现，用return返回点击的结果的方式，首先看一下自定义弹窗的实现代码：
KSPopupView *popup = [[KSPopupView alloc] init]; NSIntegerbuttonIndex = [popup doModal]; NSLog(@"选择了%ld", (long)buttonIndex); @implementationKSPopupView{BOOL_bModel;NSInteger_selectBtnIndex; } - (NSInteger)doModal { [selfperformSelector:@selector(showAlert)]; _bModel =YES;while(_bModel) { [[NSRunLoopmainRunLoop] runMode:NSDefaultRunLoopModebeforeDate:[NSDatedistantFuture]]; }return_selectBtnIndex; } - (void)showAlert {UIView*view = [[UIViewalloc] initWithFrame:CGRectMake(20,100,200,100)]; [view setBackgroundColor:[UIColorredColor]];UIButton*button = [[UIButtonalloc] initWithFrame:CGRectMake(0,0,50,30)]; [button setTitle:@"ok"forState:UIControlStateNormal]; [button setBackgroundColor:[UIColorgreenColor]]; [button addTarget:selfaction:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside]; [view addSubview:button]; [[UIApplicationsharedApplication].keyWindow addSubview:view]; } - (void)buttonClick:(UIButton*)button { [button.superview removeFromSuperview]; _selectBtnIndex =1; _bModel =NO; }
ok，没有问题，假如你想使用系统自带的UIAlertView的话，也是一样的，只是不要在程序刚启动的时候调用，不然会无法弹出（原因暂时还不知道）,下面是UIAlertView的例子：
- (NSInteger)doModal { [selfshowAlert]; _bModel =YES;while(_bModel) { [[NSRunLoopmainRunLoop] runMode:NSDefaultRunLoopModebeforeDate:[NSDatedistantFuture]]; }return_selectBtnIndex; } - (void)showAlert {UIAlertView*alertView = [[UIAlertViewalloc] initWithTitle:@""message:@"okookoko"delegate:selfcancelButtonTitle:@"cancel"otherButtonTitles:@"ok",nil]; [alertView show]; } - (void)alertView:(UIAlertView*)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { _selectBtnIndex = buttonIndex; _bModel =NO; }
