Add Subview to ViewController with Block and ARC in encapsulated Class - objective-c

Question

i'am searching for a way to add a Subview (in my example a UIPickerView) to a ViewController like MBProgressHUD. My Subview is an UIView which has a UIPickerView and a UIButton on it to select an item.
I use this view in different ViewControllers, so it would be nice to encapsulate it in a own Class. My Problem is that it only works without ARC. With ARC the App crash with EXC_BAD_ACCESS CODE = 1.... So i think i have to set the variables to strong. Can anyone help me?!
The .h File looks as the following:
#
import <Foundation/Foundation.h>
typedef void(^completition)(NSString *result);
#interface CDPickerView : NSObject<UIPickerViewDataSource, UIPickerViewDelegate>
#property(nonatomic, strong) __block UIView *_view;
#property(nonatomic, strong) __block NSMutableArray *_selection;
-(void)addPickerToView:(UIView*)view withSelection:(NSMutableArray*)selection andReturnSelectedUsingBlock:(completition) compBlock;
#end
The .m File:
#import "CDPickerView.h"
#interface CDPickerView (){
// __strong UIView *_view;
// __strong NSMutableArray *_selection;
__strong void (^completitionTest)(NSString* result);
}
#end
#implementation CDPickerView
-(id)init{
if(!self){
self = [self init];
}
return self;
}
-(void)addPickerToView:(UIView *)view withSelection:(NSMutableArray *)selection andReturnSelectedUsingBlock:(completition) compblock{
self._view = view;
self._selection = [[NSMutableArray alloc] initWithArray:selection];
completitionTest = compblock;
dispatch_async(dispatch_get_main_queue(), ^(void){
[self addSelectionView];
});
}
-(void)addPickerToView:(UIView *)view withSelection:(NSMutableArray *)selection{
__view = view;
__selection = [[NSMutableArray alloc] initWithArray:selection];
dispatch_async(dispatch_get_main_queue(), ^(void){
[self addSelectionView];
});
}
-(void)addSelectionView{
__strong UIView *custView = [[UIView alloc]initWithFrame:CGRectMake(5, 5, 310, 300)];
custView.layer.cornerRadius = 10.0;
custView.backgroundColor = [[UIColor lightGrayColor] colorWithAlphaComponent:0.90];
__strong UIPickerView *picker = [[UIPickerView alloc]initWithFrame:CGRectMake(5, 5, 290, 200)];
picker.dataSource = self;
picker.delegate = self;
[custView addSubview:picker];
__strong UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 210, 310, 40)];
[button setTitle:#"Auswählen" forState:UIControlStateNormal];
// button.frame =
button.backgroundColor = [UIColor whiteColor];
button.titleLabel.font = [UIFont systemFontOfSize:20.0];
button.titleLabel.textColor = [UIColor blackColor];
[button addTarget:self action:#selector(choiceButtonTapped) forControlEvents:UIControlEventTouchUpInside];
[custView addSubview:button];
[__view addSubview:custView];
[picker reloadAllComponents];
}
-(void)choiceButtonTapped{
UIView *view = [[__view subviews] lastObject];
UIPickerView *picker = [[view subviews] objectAtIndex:0];
NSString *result = [__selection objectAtIndex:[picker selectedRowInComponent:0]];
completitionTest(result);
[view removeFromSuperview];
}
-(NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
return [__selection objectAtIndex:row];
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
return __selection.count;
}
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 1;
}
#end
To add this view i do the following:
__strong NSMutableArray *selection = [[NSMutableArray alloc]initWithObjects:#"Test1",#"Test2",#"Test3",#"Test4", nil];
__strong CDPickerView *picker = [[CDPickerView alloc]init];
[picker addPickerToView:self.view withSelection:selection andReturnSelectedUsingBlock:^(NSString *result) {
NSLog(#"Test: %#",result);
}];
Thank for your help!

Answer 1

First of all it seems that you should read where __strong and __block should be user.
Change
#property(nonatomic, strong) __block UIView *_view;
#property(nonatomic, strong) __block NSMutableArray *_selection;
to
#property(nonatomic, strong) UIView *_view;
#property(nonatomic, strong) NSMutableArray *_selection;
and
completitionTest = compblock;
to
completitionTest = [compblock copy];
in -(void)addPickerToView:(UIView *)view withSelection:(NSMutableArray *)selection