ios实战-runloop实现的同步弹窗

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;

}