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Automatically use Auto Layout or springs/struts
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And fix some auto layout issues
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@StefanLage
StefanLage committed Feb 14, 2015
1 parent fa3f787 commit 4a47101
Showing 1 changed file with 51 additions and 42 deletions.
93 changes: 51 additions & 42 deletions SLPagingView/SLPagingViewController.m
View file
Original file line number Diff line number Diff line change
Expand Up @@ -350,28 +350,17 @@ -(void)addNavigationItem:(UIView*)v tag:(int)tag{

-(void)setupPagingProcess{
// Make our ScrollView
self.scrollView = [UIScrollView new];
CGRect frame = CGRectMake(0, 0, SCREEN_SIZE.width, self.view.bounds.size.height);
self.scrollView = [[UIScrollView alloc] initWithFrame:frame];
self.scrollView.backgroundColor = [UIColor clearColor];
self.scrollView.pagingEnabled = YES;
self.scrollView.showsHorizontalScrollIndicator = NO;
self.scrollView.showsVerticalScrollIndicator = NO;
self.scrollView.delegate = self;
self.scrollView.bounces = NO;
self.scrollView.translatesAutoresizingMaskIntoConstraints = NO;
[self.scrollView setContentInset:UIEdgeInsetsMake(0, 0, -80, 0)];
[self.view addSubview:self.scrollView];

// setup scrollview constraints
// Width constraint, equal parent view width
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[scrollView]|"
options:0
metrics:nil
views:@{@"scrollView": self.scrollView}]];
// Height constraint, equal parent view height
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[scrollView]|"
options:0
metrics:nil
views:@{@"scrollView": self.scrollView}]];
// Adds all views
[self addControllers];

Expand All @@ -393,41 +382,54 @@ -(void)addControllers{
if(self.viewControllers
&& self.viewControllers.count > 0){
float width = SCREEN_SIZE.width * self.viewControllers.count;
float height = CGRectGetHeight(self.view.frame) - CGRectGetHeight(self.navigationBarView.frame);
float height = CGRectGetHeight(self.view.bounds) - CGRectGetHeight(self.navigationBarView.bounds);
self.scrollView.contentSize = (CGSize){width, height};
__block int i = 0;
[self.viewControllers enumerateKeysAndObjectsUsingBlock:^(NSNumber *key, id obj, BOOL *stop) {
UIView *v = (UIView*)obj;
[self.scrollView addSubview:v];
v.translatesAutoresizingMaskIntoConstraints = NO;
// Width constraint, half of parent view width
[self.scrollView addConstraint:[NSLayoutConstraint constraintWithItem:v
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:self.scrollView
attribute:NSLayoutAttributeWidth
multiplier:1.0
constant:0]];
// Height constraint, half of parent view height
[self.scrollView addConstraint:[NSLayoutConstraint constraintWithItem:v
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:self.scrollView
attribute:NSLayoutAttributeHeight
multiplier:1.0
constant:0]];
UIView *previous = [self.viewControllers objectForKey:[NSNumber numberWithFloat:([key intValue] - 1)]];
if(previous)
// Distance constraint: set distance between previous view and the current one
[self.scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[previous]-0-[v]"
if([self useAutoLayout:v]){
// Using AutoLayout
v.translatesAutoresizingMaskIntoConstraints = NO;
// Width constraint, half of parent view width
[self.scrollView addConstraint:[NSLayoutConstraint constraintWithItem:v
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:self.scrollView
attribute:NSLayoutAttributeWidth
multiplier:1.0
constant:0]];
// Height constraint, half of parent view height
[self.scrollView addConstraint:[NSLayoutConstraint constraintWithItem:v
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:self.scrollView
attribute:NSLayoutAttributeHeight
multiplier:1.0
constant:0]];
UIView *previous = [self.viewControllers objectForKey:[NSNumber numberWithFloat:([key intValue] - 1)]];
if(previous)
// Distance constraint: set distance between previous view and the current one
[self.scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[previous]-0-[v]"
options:0
metrics:nil
views:@{@"v" : v, @"previous" : previous}]];
else
// First view
[self.scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[v]"
options:0
metrics:nil
views:@{@"v" : v }]];
// Oridnate constraint : set the space between the Top and the current view
[self.scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:|-%f-[v]", CGRectGetHeight(self.navigationBarView.frame)]
options:0
metrics:nil
views:@{@"v" : v,
@"previous" : previous}]];
// Oridnate constraint : set the space between the Top and the current view
[self.scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:|-%f-[v]", CGRectGetHeight(self.navigationBarView.frame)]
options:0
metrics:nil
views:@{@"v" : v}]];
views:@{@"v" : v}]];
}
else{
v.frame = (CGRect){SCREEN_SIZE.width * i, 0, SCREEN_SIZE.width, CGRectGetHeight(self.view.frame)};
i++;
}
}];
}
}
Expand All @@ -446,6 +448,13 @@ -(CGSize) getLabelSize:(UILabel *)lbl{
return [[lbl text] sizeWithAttributes:@{NSFontAttributeName:[lbl font]}];;
}

/**
* Check whether the app use Auto Layout
*/
-(BOOL)useAutoLayout:(UIView*)someView{
return someView.constraints.count;
}

#pragma mark - Internal Methods
#pragma mark - Views management

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