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;
}